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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 43,220 $ 31,082 $ 41,311
Unrealized gains and losses:      
Unrealized holding losses on available-for-sale securities arising during the period (1,350) (5,624) (2,991)
Tax effect 532 2,142 1,196
Net of tax (818) (3,482) (1,795)
Unrealized gains on securities transferred from held-to-maturity to available-for-sale during the period 10,069
Tax effect (3,815)
Net of tax 6,254
Reclassification adjustment for realized gains included in net income (1,596) (4,234) (3,931)
Tax effect 579 1,682 1,564
Net of tax (1,017) (2,552) (2,367)
Amortization of unrealized net losses on held-to-maturity securities transferred from available-for-sale securities 1,986 220
Tax effect (813) (90)
Net of tax 1,173 130
Unrealized gains (losses) on cash flow hedges 710 219 (179)
Tax effect (290) (90) 73
Net of tax 420 129 (106)
Unrealized pension plan (losses) gains:      
Unrealized pension plan gains (losses) before reclassifications (2) (2) 485
Tax effect 1 1 (198)
Net of tax (1) (1) 287
Reclassification adjustment for realized losses included in net income 412 407 433
Tax effect (169) (165) (177)
Net of tax 243 242 256
Total other comprehensive income (loss) (1,173) 1,763 (3,595)
Total comprehensive income $ 42,047 $ 32,845 $ 37,716