Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Automobile          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unpaid principal balance of impaired loans with no allowance recorded $ 0   $ 0   $ 0
Average balance of impaired loans with no allowance recorded 0 $ 0 0 $ 0  
Interest income recognized on impaired loans with no allowance recorded 0 0 0 0  
Home Equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unpaid principal balance of impaired loans with no allowance recorded 0   0   0
Average balance of impaired loans with no allowance recorded 0 0 0 0  
Interest income recognized on impaired loans with no allowance recorded 0 0 0 0  
Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unpaid principal balance of impaired loans with no allowance recorded 0   0   0
Average balance of impaired loans with no allowance recorded 0 1,298 0 1,350  
Interest income recognized on impaired loans with no allowance recorded 0 109 0 111  
RV and Marine FInance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unpaid principal balance of impaired loans with no allowance recorded 0   0    
Average balance of impaired loans with no allowance recorded 0   0    
Interest income recognized on impaired loans with no allowance recorded 0   0    
Commercial | Commercial and Industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 261,285   261,285   299,606
Unpaid principal balance of impaired loans with no allowance recorded 270,571   270,571   358,712
Average balance of impaired loans with no allowance recorded 262,631 289,138 268,041 284,128  
Interest income recognized on impaired loans with no allowance recorded 4,852 2,392 9,352 4,623  
Ending balance of impaired loans with allowance recorded 283,409   283,409   406,243
Unpaid principal balance of impaired loans with allowance recorded 342,188   342,188   448,121
Related Allowance 24,423   24,423   22,259
Impaired Financing Receivable, Average Recorded Investment 520,697 580,899 578,652 553,646  
Impaired Financing Receivable, Interest Income, Accrual Method 6,854 4,131 13,260 8,452  
Average balance of impaired loans with allowance recorded 258,066 291,761 310,611 269,518  
Interest income recognized on impaired loans with allowance recorded 2,002 1,739 3,908 3,829  
Loans considered impaired due to status as a TDR 115,000   115,000   293,000
Impaired Financing Receivable, Recorded Investment 544,694   544,694   705,849
Impaired Financing Receivable, Unpaid Principal Balance 612,759   612,759   806,833
Commercial | Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 76,463   76,463   88,817
Unpaid principal balance of impaired loans with no allowance recorded 106,248   106,248   126,152
Average balance of impaired loans with no allowance recorded 82,296 72,569 84,865 72,640  
Interest income recognized on impaired loans with no allowance recorded 1,937 1,855 3,937 3,472  
Ending balance of impaired loans with allowance recorded 34,270   34,270   97,238
Unpaid principal balance of impaired loans with allowance recorded 41,695   41,695   107,512
Related Allowance 2,340   2,340   3,434
Impaired Financing Receivable, Average Recorded Investment 121,049 130,926 143,428 142,141  
Impaired Financing Receivable, Interest Income, Accrual Method 2,390 2,470 4,857 4,845  
Average balance of impaired loans with allowance recorded 38,753 58,357 58,563 69,501  
Interest income recognized on impaired loans with allowance recorded 453 615 920 1,373  
Loans considered impaired due to status as a TDR 23,000   23,000   81,000
Impaired Financing Receivable, Recorded Investment 110,733   110,733   186,055
Impaired Financing Receivable, Unpaid Principal Balance 147,943   147,943   233,664
Consumer | Automobile          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 0   0   0
Ending balance of impaired loans with allowance recorded 32,431   32,431   30,961
Unpaid principal balance of impaired loans with allowance recorded 32,642   32,642   31,298
Related Allowance 1,889   1,889   1,850
Impaired Financing Receivable, Average Recorded Investment 32,581 32,032 32,041 31,789  
Impaired Financing Receivable, Interest Income, Accrual Method 546 524 1,080 1,102  
Average balance of impaired loans with allowance recorded 32,581 32,032 32,041 31,789  
Interest income recognized on impaired loans with allowance recorded 546 524 1,080 1,102  
Impaired Financing Receivable, Recorded Investment 32,431   32,431   30,961
Impaired Financing Receivable, Unpaid Principal Balance 32,642   32,642   31,298
Consumer | Home Equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 0   0   0
Ending balance of impaired loans with allowance recorded 325,805   325,805   319,404
Unpaid principal balance of impaired loans with allowance recorded 357,738   357,738   352,722
Related Allowance 17,844   17,844   15,032
Impaired Financing Receivable, Average Recorded Investment 326,280 248,056 323,988 248,317  
Impaired Financing Receivable, Interest Income, Accrual Method 3,977 2,962 7,927 5,930  
Average balance of impaired loans with allowance recorded 326,280 248,056 323,988 248,317  
Interest income recognized on impaired loans with allowance recorded 3,977 2,962 7,927 5,930  
Impaired Financing Receivable, Recorded Investment 325,805   325,805   319,404
Impaired Financing Receivable, Unpaid Principal Balance 357,738   357,738   352,722
Consumer | Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 0   0   0
Ending balance of impaired loans with allowance recorded 329,050   329,050   327,753
Unpaid principal balance of impaired loans with allowance recorded 363,277   363,277   363,099
Related Allowance 11,578   11,578   12,849
Impaired Financing Receivable, Average Recorded Investment 339,289 353,787 335,444 358,674  
Impaired Financing Receivable, Interest Income, Accrual Method 2,903 3,136 6,013 6,175  
Average balance of impaired loans with allowance recorded 339,289 352,489 335,444 357,324  
Interest income recognized on impaired loans with allowance recorded 2,903 3,027 6,013 6,064  
Impaired Financing Receivable, Recorded Investment 329,050   329,050   327,753
Impaired Financing Receivable, Unpaid Principal Balance 363,277   363,277   363,099
Consumer | RV and Marine FInance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 0   0   0
Unpaid principal balance of impaired loans with no allowance recorded         0
Average balance of impaired loans with no allowance recorded   0   0  
Interest income recognized on impaired loans with no allowance recorded   0   0  
Ending balance of impaired loans with allowance recorded 1,331   1,331   0
Unpaid principal balance of impaired loans with allowance recorded 1,355   1,355   0
Related Allowance 134   134   0
Impaired Financing Receivable, Average Recorded Investment 1,009 0 672 0  
Impaired Financing Receivable, Interest Income, Accrual Method 23 0 34 0  
Average balance of impaired loans with allowance recorded 1,009 0 672 0  
Interest income recognized on impaired loans with allowance recorded 23 0 34 0  
Impaired Financing Receivable, Recorded Investment 1,331   1,331   0
Impaired Financing Receivable, Unpaid Principal Balance 1,355   1,355   0
Consumer | Other Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 0   0   0
Unpaid principal balance of impaired loans with no allowance recorded 0   0   0
Average balance of impaired loans with no allowance recorded 0 19 0 30  
Interest income recognized on impaired loans with no allowance recorded 0 2 0 104  
Ending balance of impaired loans with allowance recorded 4,126   4,126   3,897
Unpaid principal balance of impaired loans with allowance recorded 4,126   4,126   3,897
Related Allowance 253   253   260
Impaired Financing Receivable, Average Recorded Investment 4,186 4,831 4,090 4,784  
Impaired Financing Receivable, Interest Income, Accrual Method 55 55 111 224  
Average balance of impaired loans with allowance recorded 4,186 4,812 4,090 4,754  
Interest income recognized on impaired loans with allowance recorded 55 $ 53 111 $ 120  
Impaired Financing Receivable, Recorded Investment 4,126   4,126   3,897
Impaired Financing Receivable, Unpaid Principal Balance $ 4,126   $ 4,126   $ 3,897