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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 $ 11,880 $ 10,391
Unrealized gains and losses on securities:    
Unrealized holding (losses) gains on available-for-sale securities arising during the period 689 895
Tax effect (268) (357)
Net of tax 421 538
Reclassification adjustment for realized gains included in net income (1,596)
Tax effect 579
Net of tax (1,017)
Amortization of unrealized net losses on held-to-maturity securities transferred from available-for-sale securities 51
Tax effect (20)
Net of tax 31
Unrealized gains (losses) on cash flow hedge 160 (1,437)
Tax effect (65) 587
Net of tax 95 (850)
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 103 102
Tax effect (42) (41)
Net of tax 61 61
Total other comprehensive loss (441) (221)
Total comprehensive income $ 11,439 $ 10,170