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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net income $ 6,480 $ 5,019
Net change in fair value of interest rate swap agreements designated as cash flow hedges:    
Unrealized gain (loss) on interest rate swaps, net of tax of ($3) and $45, respectively 6 (83)
Reclassification adjustment for losses recognized in earnings, net of tax of ($27) and ($31), respectively 49 58
Net change in fair value of interest rate swap agreements designated as cash flow hedges 55 (25)
Unrealized gains on other-than-temporarily impaired securities available for sale:    
Unrealized gains (losses) arising during the period, net of tax of ($47) and $97, respectively 87 (181)
Reclassification adjustment for realized gains included in net income, net of tax of $484 and $0, respectively (899) 0
Unrealized gains on other-than-temporarily impaired securities available for sale net of reclassification adjustment for realized gains (losses) included in net income (812) (181)
Unrealized gains on other securities available for sale:    
Unrealized (losses) gains arising during the period, net of tax of ($456) and ($1,946), respectively 850 3,614
Other comprehensive income 93 3,408
COMPREHENSIVE INCOME $ 6,573 $ 8,427