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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 13,077 $ 11,856 $ 32,640 $ 33,106
Unrealized gains and losses:        
Unrealized holding gains (losses) on available-for-sale securities arising during the period 415 (523) 1,332 1,551
Tax effect (165) 187 (525) (634)
Net of tax 250 (336) 807 917
Unrealized gains on securities transferred from held-to-maturity to available-for-sale the period 10,069 10,069
Tax effect (3,815) (3,815)
Net of tax 6,254   6,254
Reclassification adjustment for realized gains included in net income (4,131) (1,596) (4,234)
Tax effect 1,640 579 1,682
Net of tax (2,491) (1,017) (2,552)
Amortization of unrealized net losses on held-to-maturity securities transferred from available-for-sale securities 1,890 1,986
Tax effect (774) (813)
Net of tax   1,116 1,173
Unrealized gains (losses) on cash flow hedges 119 644 76 (1,081)
Tax effect (48) (263) (31) 441
Net of tax 71 381 45 (640)
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 amortization included in net income 103 204 309 306
Tax effect (42) (83) (126) (124)
Net of tax 61 121 183 182
Total other comprehensive income 382 5,045 17 5,333
Total comprehensive income $ 13,459 $ 16,901 $ 32,657 $ 38,439