Quarterly report pursuant to Section 13 or 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Narrative) (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2015
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Gains on securities transactions, net $ 184,000 $ 0   $ 782,000 $ 145,000  
Tax expense (benefit) related to (gains) losses on the sale of securities 64,000 0   274,000 51,000  
Transfer from securities available for sale to securities held to maturity     $ 201,800,000      
Held to maturity securities unrealized gains before tax     $ 8,100,000 4,000,000   $ 5,200,000
Accretion expense 251,000 365,000   780,000 1,300,000  
Tax expense (benefit) related to (gains) losses for AFS securities transferred to HTM 88,000 128,000   273,000 439,000  
Tax expense (benefit) related to (gains) losses on the cash flow hedges (102,000) (83,000)   (370,000) (233,000)  
Reclassification adjustment for gains (losses) included in net income (9,000) (83,000)   (49,000) (478,000)  
Cash Flow Hedges | Interest Expense, Net            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax 291,000 237,000   1,100,000 666,000  
Unrealized Gains (Losses) on BOLI            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Reclassification adjustment for gains (losses) included in net income $ 84,000 $ 0   $ 278,000 $ 0