Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan Purchases and Sales (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan Purchases and Sales (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Portfolio loans and leases purchased or transferred from held for sale: $ 98,303,000 $ 191,320,000     $ 440,288,000 $ 242,453,000
Portfolio loans and leases sold or transferred to loans held for sale: 2,805,577,000 194,903,000     3,046,374,000 1,144,963,000
Commercial | Commercial and Industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Portfolio loans and leases purchased or transferred from held for sale: 16,498,000 180,036,000     354,670,000 224,532,000
Portfolio loans and leases sold or transferred to loans held for sale: 1,140,096,000 98,117,000     1,380,893,000 284,019,000
Commercial | Commercial Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Portfolio loans and leases purchased or transferred from held for sale: 0 0     0 0
Portfolio loans and leases sold or transferred to loans held for sale: 124,231,000 0     124,231,000 0
Consumer | Automobile            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Portfolio loans and leases purchased or transferred from held for sale: 0 0     0 0
Portfolio loans and leases sold or transferred to loans held for sale: 1,541,250,000 0     1,541,250,000 764,158,000
Reclassification to held-for-sale       $ 1,000,000,000    
Reclassification to loans and leases     $ 262,000,000      
Consumer | Home Equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Portfolio loans and leases purchased or transferred from held for sale:   0     81,080,000 0
Portfolio loans and leases sold or transferred to loans held for sale: 0 96,786,000     0 96,786,000
Reclassification to loans and leases     $ 81,080,000      
Consumer | Residential Mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Portfolio loans and leases purchased or transferred from held for sale: 725,000 11,284,000     4,538,000 17,921,000
Portfolio loans and leases sold or transferred to loans held for sale: 0 0     0 0
Consumer | RV and Marine FInance            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Portfolio loans and leases purchased or transferred from held for sale: 0 0     0 0
Portfolio loans and leases sold or transferred to loans held for sale: 0 0     0 0
Consumer | Other Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Portfolio loans and leases purchased or transferred from held for sale: 0 0     0 0
Portfolio loans and leases sold or transferred to loans held for sale: $ 0 $ 0     $ 0 $ 0