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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 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 0 0 0  
Interest income recognized on impaired loans with no allowance recorded 0 0 0 0  
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 299,349   299,349   299,606
Unpaid principal balance of impaired loans with no allowance recorded 324,474   324,474   358,712
Average balance of impaired loans with no allowance recorded 294,513 305,956 227,611 290,163  
Interest income recognized on impaired loans with no allowance recorded 4,969 2,235 7,467 4,858  
Ending balance of impaired loans with allowance recorded 213,520   213,520   406,243
Unpaid principal balance of impaired loans with allowance recorded 245,328   245,328   448,121
Related Allowance 19,958   19,958   22,259
Impaired Financing Receivable, Average Recorded Investment 517,258 587,890 561,908 564,425  
Impaired Financing Receivable, Interest Income, Accrual Method 6,919 3,866 20,179 10,318  
Average balance of impaired loans with allowance recorded 222,745 281,934 334,297 274,262  
Interest income recognized on impaired loans with allowance recorded 1,950 1,631 12,712 5,460  
Loans considered impaired due to status as a TDR 365,000   365,000   317,000
Impaired Financing Receivable, Recorded Investment 512,869   512,869   705,849
Impaired Financing Receivable, Unpaid Principal Balance 569,802   569,802   806,833
Commercial | Real Estate Loan [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 65,382   65,382   88,817
Unpaid principal balance of impaired loans with no allowance recorded 92,215   92,215   126,152
Average balance of impaired loans with no allowance recorded   80,000   58,666  
Interest income recognized on impaired loans with no allowance recorded   907   2,257  
Ending balance of impaired loans with allowance recorded 53,078   53,078    
Unpaid principal balance of impaired loans with allowance recorded 60,366   60,366    
Related Allowance 2,880   2,880    
Loans considered impaired due to status as a TDR 84,000   84,000   81,000
Impaired Financing Receivable, Recorded Investment 118,460   118,460    
Impaired Financing Receivable, Unpaid Principal Balance 152,581   152,581    
Commercial | Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Average balance of impaired loans with no allowance recorded 71,277   80,388    
Interest income recognized on impaired loans with no allowance recorded 1,825   5,762    
Ending balance of impaired loans with allowance recorded         97,238
Unpaid principal balance of impaired loans with allowance recorded         107,512
Related Allowance         3,434
Impaired Financing Receivable, Average Recorded Investment 111,949 129,140 134,740 108,253  
Impaired Financing Receivable, Interest Income, Accrual Method 2,293 1,428 7,150 4,152  
Average balance of impaired loans with allowance recorded 40,672 49,140 54,352 49,587  
Interest income recognized on impaired loans with allowance recorded 468 521 1,388 1,895  
Impaired Financing Receivable, Recorded Investment         186,055
Impaired Financing Receivable, Unpaid Principal Balance         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 33,049   33,049   30,961
Unpaid principal balance of impaired loans with allowance recorded 33,049   33,049   31,298
Related Allowance 1,683   1,683   1,850
Impaired Financing Receivable, Average Recorded Investment 32,740 31,540 32,293 31,912  
Impaired Financing Receivable, Interest Income, Accrual Method 496 541 1,576 1,643  
Average balance of impaired loans with allowance recorded 32,740 31,540 32,293 31,912  
Interest income recognized on impaired loans with allowance recorded 496 541 1,576 1,643  
Impaired Financing Receivable, Recorded Investment 33,049   33,049   30,961
Impaired Financing Receivable, Unpaid Principal Balance 33,049   33,049   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 335,763   335,763   319,404
Unpaid principal balance of impaired loans with allowance recorded 367,870   367,870   352,722
Related Allowance 14,486   14,486   15,032
Impaired Financing Receivable, Average Recorded Investment 330,784 284,512 326,932 267,264  
Impaired Financing Receivable, Interest Income, Accrual Method 3,713 3,453 11,639 9,382  
Average balance of impaired loans with allowance recorded 330,784 284,512 326,932 267,264  
Interest income recognized on impaired loans with allowance recorded 3,713 3,453 11,639 9,382  
Impaired Financing Receivable, Recorded Investment 335,763   335,763   319,404
Impaired Financing Receivable, Unpaid Principal Balance 367,870   367,870   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 310,440   310,440   327,753
Unpaid principal balance of impaired loans with allowance recorded 341,724   341,724   363,099
Related Allowance 8,060   8,060   12,849
Impaired Financing Receivable, Average Recorded Investment 319,745 344,237 329,193 353,259  
Impaired Financing Receivable, Interest Income, Accrual Method 2,837 2,978 8,851 9,041  
Average balance of impaired loans with allowance recorded 319,745 344,237 329,193 353,259  
Interest income recognized on impaired loans with allowance recorded 2,837 2,978 8,851 9,041  
Impaired Financing Receivable, Recorded Investment 310,440   310,440   327,753
Impaired Financing Receivable, Unpaid Principal Balance 341,724   341,724   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 1,520   1,520   0
Unpaid principal balance of impaired loans with allowance recorded 1,520   1,520   0
Related Allowance 88   88   0
Impaired Financing Receivable, Average Recorded Investment 1,425 0 884 0  
Impaired Financing Receivable, Interest Income, Accrual Method 23 0 58 0  
Average balance of impaired loans with allowance recorded 1,425 0 884 0  
Interest income recognized on impaired loans with allowance recorded 23 0 58 0  
Impaired Financing Receivable, Recorded Investment 1,520   1,520   0
Impaired Financing Receivable, Unpaid Principal Balance 1,520   1,520   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 0 0 0  
Interest income recognized on impaired loans with no allowance recorded 0 0 0 0  
Ending balance of impaired loans with allowance recorded 6,456   6,456   3,897
Unpaid principal balance of impaired loans with allowance recorded 6,456   6,456   3,897
Related Allowance 1,288   1,288   260
Impaired Financing Receivable, Average Recorded Investment 6,944 4,454 7,117 4,627  
Impaired Financing Receivable, Interest Income, Accrual Method 47 58 184 178  
Average balance of impaired loans with allowance recorded 6,944 4,454 7,117 4,627  
Interest income recognized on impaired loans with allowance recorded 47 $ 58 184 $ 178  
Impaired Financing Receivable, Recorded Investment 6,456   6,456   3,897
Impaired Financing Receivable, Unpaid Principal Balance $ 6,456   $ 6,456   $ 3,897