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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
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
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 356,398   356,398     255,801
Unpaid principal balance of impaired loans with no allowance recorded 418,304   418,304     279,551
Average balance of impaired loans with no allowance recorded 305,956 133,022 290,163 93,256    
Interest income recognized on impaired loans with no allowance recorded 2,235 710 4,858 1,694    
Ending balance of impaired loans with allowance recorded 255,894   255,894     246,249
Unpaid principal balance of impaired loans with allowance recorded 270,828   270,828     274,203
Related Allowance 25,850   25,850     21,916
Average balance of impaired loans with allowance recorded 281,934 298,417 274,262 260,987    
Interest income recognized on impaired loans with allowance recorded 1,631 3,420 5,460 9,688    
Loans considered impaired due to status as a TDR 111,000   111,000     91,000
Commercial | Commercial Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Ending balance of impaired loans with no allowance recorded 103,705   103,705     68,260
Unpaid principal balance of impaired loans with no allowance recorded 133,670   133,670     125,814
Average balance of impaired loans with no allowance recorded 80,000 56,927 58,666 61,767    
Interest income recognized on impaired loans with no allowance recorded 907 590 2,257 1,734    
Ending balance of impaired loans with allowance recorded 46,388   46,388     90,475
Unpaid principal balance of impaired loans with allowance recorded 57,405   57,405     104,930
Related Allowance 3,242   3,242     8,114
Average balance of impaired loans with allowance recorded 49,140 126,694 49,587 158,621    
Interest income recognized on impaired loans with allowance recorded 521 2,695 1,895 9,612    
Loans considered impaired due to status as a TDR 28,000   28,000     35,000
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 32,279   32,279     31,304
Unpaid principal balance of impaired loans with allowance recorded 32,644   32,644     31,878
Related Allowance 1,802   1,802     1,779
Average balance of impaired loans with allowance recorded 31,540 29,371 31,912 29,878    
Interest income recognized on impaired loans with allowance recorded 541 554 1,643 1,659    
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 324,106   324,106     248,839
Unpaid principal balance of impaired loans with allowance recorded 357,649   357,649     284,957
Related Allowance 14,803   14,803     16,242
Average balance of impaired loans with allowance recorded 284,512 288,685 267,264 302,808    
Interest income recognized on impaired loans with allowance recorded 3,453 2,725 9,382 10,241    
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 341,063   341,063     368,449
Unpaid principal balance of impaired loans with allowance recorded 378,500   378,500     411,114
Related Allowance 14,818   14,818     16,938
Average balance of impaired loans with allowance recorded 344,237 376,026 353,259 374,854    
Interest income recognized on impaired loans with allowance recorded 2,978 3,303 9,041 9,630    
Amount of TDRs guaranteed by the U.S. government 29,000   29,000     29,000
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 0   0     0
Unpaid principal balance of impaired loans with allowance recorded 0   0     0
Related Allowance 0   0     0
Average balance of impaired loans with allowance recorded 0 0 0 0    
Interest income recognized on impaired loans with allowance recorded 0 0 0 0    
Consumer | Other Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Ending balance of impaired loans with no allowance recorded 0   0     52
Unpaid principal balance of impaired loans with no allowance recorded 0   0     101
Average balance of impaired loans with no allowance recorded 0 50 0 51    
Interest income recognized on impaired loans with no allowance recorded 0 3 0 11    
Ending balance of impaired loans with allowance recorded 4,244   4,244     4,640
Unpaid principal balance of impaired loans with allowance recorded 4,244   4,244     4,649
Related Allowance 302   302     $ 176
Average balance of impaired loans with allowance recorded 4,454 4,801 4,627 4,683    
Interest income recognized on impaired loans with allowance recorded $ 58 $ 64 $ 178 $ 191