Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial $ 21,253,692 $ 20,559,834
Commercial real estate 5,281,810 5,268,651
Automobile 9,919,921 9,480,678
Home equity 8,422,439 8,470,482
Residential mortgage 6,081,984 5,998,400
Other consumer 579,513 563,054
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 21,253,692 20,559,834
Commercial and Industrial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 19,888,676 19,257,789
Commercial and Industrial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 394,917 399,339
Commercial and Industrial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 962,581 895,577
Commercial and Industrial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 7,518 7,129
Commercial and Industrial | Purchased credit-impaired    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 14,600 21,017
Commercial and Industrial | Purchased credit-impaired | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 3,013 3,051
Commercial and Industrial | Purchased credit-impaired | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 670 674
Commercial and Industrial | Purchased credit-impaired | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 10,917 15,661
Commercial and Industrial | Purchased credit-impaired | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 0 1,631
Commercial and Industrial | Owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 4,006,551 4,012,800
Commercial and Industrial | Owner occupied | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 3,747,191 3,731,113
Commercial and Industrial | Owner occupied | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 85,644 114,490
Commercial and Industrial | Owner occupied | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 173,241 165,301
Commercial and Industrial | Owner occupied | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 475 1,896
Commercial and Industrial | Other commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 17,232,541 16,526,017
Commercial and Industrial | Other commercial and industrial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 16,138,472 15,523,625
Commercial and Industrial | Other commercial and industrial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 308,603 284,175
Commercial and Industrial | Other commercial and industrial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 778,423 714,615
Commercial and Industrial | Other commercial and industrial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 7,043 3,602
Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 5,281,810 5,268,651
Commercial Real Estate | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 5,096,521 5,066,054
Commercial Real Estate | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 76,031 79,787
Commercial Real Estate | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 107,747 121,167
Commercial Real Estate | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 1,511 1,643
Commercial Real Estate | Purchased credit-impaired    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 12,694 13,758
Commercial Real Estate | Purchased credit-impaired | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 7,115 7,194
Commercial Real Estate | Purchased credit-impaired | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 447 397
Commercial Real Estate | Purchased credit-impaired | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 5,132 6,167
Commercial Real Estate | Purchased credit-impaired | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 0 0
Commercial Real Estate | Retail properties    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 1,573,834 1,506,709
Commercial Real Estate | Retail properties | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 1,555,093 1,473,014
Commercial Real Estate | Retail properties | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 8,240 10,865
Commercial Real Estate | Retail properties | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 10,501 22,830
Commercial Real Estate | Retail properties | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 0 0
Commercial Real Estate | Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 1,088,122 1,078,218
Commercial Real Estate | Multi-family | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 1,042,495 1,029,138
Commercial Real Estate | Multi-family | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 28,005 28,862
Commercial Real Estate | Multi-family | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 17,218 19,898
Commercial Real Estate | Multi-family | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 404 320
Commercial Real Estate | Office    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 862,185 894,625
Commercial Real Estate | Office | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 806,473 822,824
Commercial Real Estate | Office | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 15,129 35,350
Commercial Real Estate | Office | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 40,161 36,011
Commercial Real Estate | Office | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 422 440
Commercial Real Estate | Industrial and warehouse    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 401,377 504,167
Commercial Real Estate | Industrial and warehouse | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 376,898 493,402
Commercial Real Estate | Industrial and warehouse | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 20,588 259
Commercial Real Estate | Industrial and warehouse | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 3,837 10,450
Commercial Real Estate | Industrial and warehouse | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 54 56
Commercial Real Estate | Other commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 1,343,598 1,271,174
Commercial Real Estate | Other commercial real estate | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 1,308,447 1,240,482
Commercial Real Estate | Other commercial real estate | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 3,622 4,054
Commercial Real Estate | Other commercial real estate | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 30,898 25,811
Commercial Real Estate | Other commercial real estate | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate 631 827
Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 9,919,921 9,480,678
Automobile | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 4,894,441 4,680,684
Automobile | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 3,618,491 3,454,585
Automobile | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,140,522 1,086,914
Automobile | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 266,467 258,495
Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 8,422,439 8,470,482
Home Equity | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 5,158,906 5,210,741
Home Equity | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 2,481,188 2,466,425
Home Equity | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 574,003 582,326
Home Equity | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 208,342 210,990
Home Equity | Secured by first-lien    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 5,189,373 5,191,485
Home Equity | Secured by first-lien | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 3,346,422 3,369,657
Home Equity | Secured by first-lien | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 1,463,054 1,441,574
Home Equity | Secured by first-lien | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 264,024 258,328
Home Equity | Secured by first-lien | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 115,873 121,926
Home Equity | Secured by junior-lien    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 3,233,066 3,278,997
Home Equity | Secured by junior-lien | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 1,812,484 1,841,084
Home Equity | Secured by junior-lien | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 1,018,134 1,024,851
Home Equity | Secured by junior-lien | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 309,979 323,998
Home Equity | Secured by junior-lien | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Home equity 92,469 89,064
Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 6,081,984 5,998,400
Residential Mortgage | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 3,652,835 3,564,064
Residential Mortgage | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 1,791,056 1,813,779
Residential Mortgage | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 550,706 567,984
Residential Mortgage | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 87,387 52,573
Residential Mortgage | Purchased credit-impaired    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 1,492 1,454
Residential Mortgage | Purchased credit-impaired | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 278 381
Residential Mortgage | Purchased credit-impaired | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 737 777
Residential Mortgage | Purchased credit-impaired | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 477 296
Residential Mortgage | Purchased credit-impaired | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 0 0
Residential Mortgage | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 6,080,492 5,996,946
Residential Mortgage | Residential mortgage | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 3,652,557 3,563,683
Residential Mortgage | Residential mortgage | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 1,790,319 1,813,002
Residential Mortgage | Residential mortgage | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 550,229 567,688
Residential Mortgage | Residential mortgage | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential mortgage 87,387 52,573
Other Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 579,513 563,054
Other Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 216,875 233,969
Other Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 263,380 269,746
Other Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 54,790 49,650
Other Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 44,468 9,689
Other Consumer | Purchased credit-impaired    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 39 52
Other Consumer | Purchased credit-impaired | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 0 0
Other Consumer | Purchased credit-impaired | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 39 52
Other Consumer | Purchased credit-impaired | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 0 0
Other Consumer | Purchased credit-impaired | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 0 0
Other Consumer | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 579,474 563,002
Other Consumer | Other consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 216,875 233,969
Other Consumer | Other consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 263,341 269,694
Other Consumer | Other consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer 54,790 49,650
Other Consumer | Other consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other consumer $ 44,468 $ 9,689