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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 60,352 $ 43,220 $ 31,082
Unrealized gains and losses:      
Unrealized holding losses on available-for-sale securities arising during the period (6,444) (1,350) (5,624)
Tax effect 1,638 532 2,142
Net of tax (4,806) (818) (3,482)
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)
Tax effect 579 1,682
Net of tax (1,017) (2,552)
Amortization of unrealized net losses on held-to-maturity securities transferred from available-for-sale securities 1,986
Tax effect (813)
Net of tax 1,173
Unrealized gains on cash flow hedges 361 710 219
Tax effect (98) (290) (90)
Net of tax 263 420 129
Unrealized pension plan (losses) gains:      
Unrealized pension plan gains (losses) before reclassifications 236 (2) (2)
Tax effect (67) 1 1
Net of tax 169 (1) (1)
Reclassification adjustment for realized losses included in net income 359 412 407
Tax effect (101) (169) (165)
Net of tax 258 243 242
Total other comprehensive income (loss) (4,116) (1,173) 1,763
Total comprehensive income $ 56,236 $ 42,047 $ 32,845