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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
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 276,000   276,000   284,000
Unpaid principal balance of impaired loans with no allowance recorded 305,000   305,000   311,000
Average balance of impaired loans with no allowance recorded 259,000 263,000 268,000 268,000  
Interest income recognized on impaired loans with no allowance recorded 6,000 5,000 10,000 9,000  
Ending balance of impaired loans with allowance recorded 277,000   277,000   257,000
Unpaid principal balance of impaired loans with allowance recorded 311,000   311,000   280,000
Related Allowance 37,000   37,000   29,000
Impaired Financing Receivable, Average Recorded Investment 554,000 521,000 551,000 579,000  
Impaired Financing Receivable, Interest Income, Accrual Method 9,000 7,000 16,000 13,000  
Average balance of impaired loans with allowance recorded 295,000 258,000 283,000 311,000  
Interest income recognized on impaired loans with allowance recorded 3,000 2,000 6,000 4,000  
Loans considered impaired due to status as a TDR 401,000   401,000   382,000
Impaired Financing Receivable, Recorded Investment 553,000   553,000   541,000
Impaired Financing Receivable, Unpaid Principal Balance 616,000   616,000   591,000
Commercial | Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 39,000   39,000   56,000
Unpaid principal balance of impaired loans with no allowance recorded 58,000   58,000   81,000
Average balance of impaired loans with no allowance recorded   82,000   85,000  
Interest income recognized on impaired loans with no allowance recorded   2,000   4,000  
Ending balance of impaired loans with allowance recorded 50,000   50,000    
Unpaid principal balance of impaired loans with allowance recorded 56,000   56,000    
Related Allowance 2,000   2,000    
Loans considered impaired due to status as a TDR 79,000   79,000   93,000
Impaired Financing Receivable, Recorded Investment 89,000   89,000    
Impaired Financing Receivable, Unpaid Principal Balance 114,000   114,000    
Commercial | Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Average balance of impaired loans with no allowance recorded 55,000   55,000    
Interest income recognized on impaired loans with no allowance recorded 2,000   4,000    
Ending balance of impaired loans with allowance recorded         51,000
Unpaid principal balance of impaired loans with allowance recorded         51,000
Related Allowance         3,000
Impaired Financing Receivable, Average Recorded Investment 101,000 121,000 103,000 143,000  
Impaired Financing Receivable, Interest Income, Accrual Method 2,000 2,000 5,000 5,000  
Average balance of impaired loans with allowance recorded 46,000 39,000 48,000 58,000  
Interest income recognized on impaired loans with allowance recorded 0 0 1,000 1,000  
Impaired Financing Receivable, Recorded Investment         107,000
Impaired Financing Receivable, Unpaid Principal Balance         132,000
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 36,000   36,000   36,000
Unpaid principal balance of impaired loans with allowance recorded 40,000   40,000   40,000
Related Allowance 2,000   2,000   2,000
Impaired Financing Receivable, Average Recorded Investment 37,000 33,000 36,000 32,000  
Impaired Financing Receivable, Interest Income, Accrual Method 1,000 1,000 1,000 1,000  
Average balance of impaired loans with allowance recorded 37,000 33,000 36,000 32,000  
Interest income recognized on impaired loans with allowance recorded 1,000 1,000 1,000 1,000  
Impaired Financing Receivable, Recorded Investment 36,000   36,000   36,000
Impaired Financing Receivable, Unpaid Principal Balance 40,000   40,000   40,000
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 327,000   327,000   334,000
Unpaid principal balance of impaired loans with allowance recorded 372,000   372,000   385,000
Related Allowance 13,000   13,000   14,000
Impaired Financing Receivable, Average Recorded Investment 331,000 326,000 332,000 324,000  
Impaired Financing Receivable, Interest Income, Accrual Method 4,000 4,000 7,000 8,000  
Average balance of impaired loans with allowance recorded 331,000 326,000 332,000 324,000  
Interest income recognized on impaired loans with allowance recorded 4,000 4,000 7,000 8,000  
Impaired Financing Receivable, Recorded Investment 327,000   327,000   334,000
Impaired Financing Receivable, Unpaid Principal Balance 372,000   372,000   385,000
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 294,000   294,000   308,000
Unpaid principal balance of impaired loans with allowance recorded 327,000   327,000   338,000
Related Allowance 4,000   4,000   4,000
Impaired Financing Receivable, Average Recorded Investment 300,000 339,000 303,000 335,000  
Impaired Financing Receivable, Interest Income, Accrual Method 3,000 3,000 5,000 6,000  
Average balance of impaired loans with allowance recorded 300,000 339,000 303,000 335,000  
Interest income recognized on impaired loans with allowance recorded 3,000 3,000 5,000 6,000  
Impaired Financing Receivable, Recorded Investment 294,000   294,000   308,000
Impaired Financing Receivable, Unpaid Principal Balance 327,000   327,000   338,000
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 2,000   2,000   2,000
Unpaid principal balance of impaired loans with allowance recorded 2,000   2,000   3,000
Related Allowance 0   0   0
Impaired Financing Receivable, Average Recorded Investment 2,000 1,000 2,000 1,000  
Impaired Financing Receivable, Interest Income, Accrual Method 0 0 0 0  
Average balance of impaired loans with allowance recorded 2,000 1,000 2,000 1,000  
Interest income recognized on impaired loans with allowance recorded 0 0 0 0  
Impaired Financing Receivable, Recorded Investment 2,000   2,000   2,000
Impaired Financing Receivable, Unpaid Principal Balance 2,000   2,000   3,000
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 9,000   9,000   8,000
Unpaid principal balance of impaired loans with allowance recorded 9,000   9,000   8,000
Related Allowance 3,000   3,000   2,000
Impaired Financing Receivable, Average Recorded Investment 7,000 4,000 7,000 4,000  
Impaired Financing Receivable, Interest Income, Accrual Method 0 0 0 0  
Average balance of impaired loans with allowance recorded 7,000 4,000 7,000 4,000  
Interest income recognized on impaired loans with allowance recorded 0 $ 0 0 $ 0  
Impaired Financing Receivable, Recorded Investment 9,000   9,000   8,000
Impaired Financing Receivable, Unpaid Principal Balance $ 9,000   $ 9,000   $ 8,000