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
Mar. 31, 2017
Mar. 31, 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
Average balance of impaired loans with no allowance recorded 0 $ 0  
Interest income recognized on impaired loans with no allowance recorded 0 0  
Home Equity      
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  
Residential Mortgage      
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 1,473  
Interest income recognized on impaired loans with no allowance recorded 0 2  
RV and Marine FInance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans with no allowance recorded 0    
Average balance of impaired loans with no allowance recorded 0    
Interest income recognized on impaired loans with no allowance recorded 0    
Commercial | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with no allowance recorded 250,789   299,606
Unpaid principal balance of impaired loans with no allowance recorded 290,673   358,712
Average balance of impaired loans with no allowance recorded 275,409 261,144  
Interest income recognized on impaired loans with no allowance recorded 4,500 1,233  
Ending balance of impaired loans with allowance recorded 278,368   406,243
Unpaid principal balance of impaired loans with allowance recorded 306,613   448,121
Related Allowance 33,678   22,259
Impaired Financing Receivable, Average Recorded Investment 609,588 525,228  
Impaired Financing Receivable, Interest Income, Accrual Method 6,406 4,319  
Average balance of impaired loans with allowance recorded 334,179 264,084  
Interest income recognized on impaired loans with allowance recorded 1,906 3,086  
Loans considered impaired due to status as a TDR 117,000   293,000
Impaired Financing Receivable, Recorded Investment 529,157   705,849
Impaired Financing Receivable, Unpaid Principal Balance 597,286   806,833
Commercial | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with no allowance recorded 86,621   88,817
Unpaid principal balance of impaired loans with no allowance recorded 117,745   126,152
Average balance of impaired loans with no allowance recorded 85,829 71,807  
Interest income recognized on impaired loans with no allowance recorded 2,000 1,616  
Ending balance of impaired loans with allowance recorded 41,416   97,238
Unpaid principal balance of impaired loans with allowance recorded 49,444   107,512
Related Allowance 2,810   3,434
Impaired Financing Receivable, Average Recorded Investment 154,923 151,664  
Impaired Financing Receivable, Interest Income, Accrual Method 2,467 2,374  
Average balance of impaired loans with allowance recorded 69,094 79,857  
Interest income recognized on impaired loans with allowance recorded 467 758  
Loans considered impaired due to status as a TDR 24,000   81,000
Impaired Financing Receivable, Recorded Investment 128,037   186,055
Impaired Financing Receivable, Unpaid Principal Balance 167,189   233,664
Consumer | Automobile      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with no allowance recorded 0   0
Ending balance of impaired loans with allowance recorded 32,731   30,961
Unpaid principal balance of impaired loans with allowance recorded 32,942   31,298
Related Allowance 2,004   1,850
Impaired Financing Receivable, Average Recorded Investment 31,846 32,284  
Impaired Financing Receivable, Interest Income, Accrual Method 534 578  
Average balance of impaired loans with allowance recorded 31,846 32,284  
Interest income recognized on impaired loans with allowance recorded 534 578  
Impaired Financing Receivable, Recorded Investment 32,731   30,961
Impaired Financing Receivable, Unpaid Principal Balance 32,942   31,298
Consumer | Home Equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with no allowance recorded 0   0
Ending balance of impaired loans with allowance recorded 326,755   319,404
Unpaid principal balance of impaired loans with allowance recorded 360,622   352,722
Related Allowance 16,232   15,032
Impaired Financing Receivable, Average Recorded Investment 323,079 250,016  
Impaired Financing Receivable, Interest Income, Accrual Method 3,949 2,968  
Average balance of impaired loans with allowance recorded 323,079 250,016  
Interest income recognized on impaired loans with allowance recorded 3,949 2,968  
Impaired Financing Receivable, Recorded Investment 326,755   319,404
Impaired Financing Receivable, Unpaid Principal Balance 360,622   352,722
Consumer | Residential Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with no allowance recorded 0   0
Ending balance of impaired loans with allowance recorded 349,527   327,753
Unpaid principal balance of impaired loans with allowance recorded 383,685   363,099
Related Allowance 14,217   12,849
Impaired Financing Receivable, Average Recorded Investment 338,640 363,753  
Impaired Financing Receivable, Interest Income, Accrual Method 3,110 3,038  
Average balance of impaired loans with allowance recorded 338,640 362,280  
Interest income recognized on impaired loans with allowance recorded 3,110 3,036  
Amount of TDRs guaranteed by the U.S. government 30,000   29,000
Impaired Financing Receivable, Recorded Investment 349,527   327,753
Impaired Financing Receivable, Unpaid Principal Balance 383,685   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
Unpaid principal balance of impaired loans with no allowance recorded     0
Average balance of impaired loans with no allowance recorded   0  
Interest income recognized on impaired loans with no allowance recorded   0  
Ending balance of impaired loans with allowance recorded 687   0
Unpaid principal balance of impaired loans with allowance recorded 710   0
Related Allowance 26   0
Impaired Financing Receivable, Average Recorded Investment 343 0  
Impaired Financing Receivable, Interest Income, Accrual Method 11 0  
Average balance of impaired loans with allowance recorded 343 0  
Interest income recognized on impaired loans with allowance recorded 11 0  
Impaired Financing Receivable, Recorded Investment 687   0
Impaired Financing Receivable, Unpaid Principal Balance 710   0
Consumer | Other Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with no allowance recorded 0   0
Unpaid principal balance of impaired loans with no allowance recorded 0   0
Average balance of impaired loans with no allowance recorded 0 45  
Interest income recognized on impaired loans with no allowance recorded 0 102  
Ending balance of impaired loans with allowance recorded 4,245   3,897
Unpaid principal balance of impaired loans with allowance recorded 4,245   3,897
Related Allowance 248   260
Impaired Financing Receivable, Average Recorded Investment 4,071 4,844  
Impaired Financing Receivable, Interest Income, Accrual Method 57 168  
Average balance of impaired loans with allowance recorded 4,071 4,799  
Interest income recognized on impaired loans with allowance recorded 57 $ 66  
Impaired Financing Receivable, Recorded Investment 4,245   3,897
Impaired Financing Receivable, Unpaid Principal Balance $ 4,245   $ 3,897