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ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in the Allowance for Loan and Lease Losses for the Current and Comparable Quarter and Year-to-Date (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Receivables [Abstract]            
Balance at beginning of period $ 48,351,000 $ 46,931,000 $ 49,422,000 $ 49,422,000 $ 43,149,000 $ 43,149,000
Provision for loan and lease losses 4,462,000 1,886,000 834 7,451,000 7,381,000 10,140
Loans charged off (4,485,000) (1,131,000)   (10,935,000) (4,547,000)  
Recoveries 825,000 1,206,000   3,215,000 2,909,000  
Balance at end of period 49,153,000 48,892,000 48,351,000 49,153,000 48,892,000 49,422,000
Balance at beginning of period 6,522,000 9,777,000 8,539,000 8,539,000 10,249,000 10,249,000
Provision for loan and lease losses covered (1,509,000) (199,000)   (3,664,000) (2,000)  
Loans charged-off (14,000) (1,419,000)   (812,000) (3,147,000)  
Recoveries 382,000 567,000   1,318,000 1,626,000  
Balance at end of period 5,381,000 8,726,000 6,522,000 5,381,000 8,726,000 8,539,000
Balance at beginning of period 54,873,000 56,708,000 57,961,000 57,961,000 53,398,000 53,398,000
Provision for Loan and Lease Losses 2,953,000 1,687,000   3,787,000 7,379,000  
Loans charged-off (4,499,000) (2,550,000)   (11,747,000) (7,694,000)  
Recoveries 1,207,000 1,773,000   4,533,000 4,535,000  
Balance at end of period $ 54,534,000 $ 57,618,000 $ 54,873,000 $ 54,534,000 $ 57,618,000 $ 57,961,000