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 ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2015
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Gains on securities transactions, net $ 213 $ 481    
Tax expense (benefit) related to (gains) losses on the sale of securities 45 168    
Transfer from securities available for sale to securities held to maturity     $ 201,800  
Held to maturity securities unrealized gains before tax 3,200   $ 8,100 $ 3,600
Accretion expense 379 283    
Tax expense (benefit) related to (gains) losses for AFS securities transferred to HTM 80 99    
Tax expense (benefit) related to (gains) losses on the cash flow hedges (66) (97)    
Reclassification adjustment for gains (losses) included in net income (199) (208)    
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 315 277    
Unrealized Gains (Losses) on BOLI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustment for gains (losses) included in net income $ 19 $ 109