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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 7,683 $ 10,859 $ 19,563 $ 21,250
Unrealized gains and losses:        
Unrealized holding gains on available-for-sale securities arising during the period 224 1,179 913 2,074
Tax effect (88) (464) (356) (821)
Net of tax 136 715 557 1,253
Reclassification adjustment for realized gains included in net income (103) (1,596) (103)
Tax effect 42 579 42
Net of tax (61) (1,017) (61)
Amortization of unrealized net losses on held-to-maturity securities transferred from available-for-sale securities 44 96
Tax effect (18) (39)
Net of tax 26 57
Unrealized losses on cash flow hedges (203) (289) (43) (1,725)
Tax effect 82 118 17 704
Net of tax (121) (171) (26) (1,021)
Unrealized pension plan gains and losses:        
Unrealized pension plan losses before reclassifications (2) (1)
Tax effect 1
Net of tax (1) (1)
Reclassification adjustment for realized losses included in net income 103 206 102
Tax effect (42) (84) (41)
Net of tax 61 122 61
Total other comprehensive income (loss) 76 509 (365) 288
Total comprehensive income $ 7,759 $ 11,368 $ 19,198 $ 21,538