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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 58,670 $ 49,518 $ 33,744
Other comprehensive income (loss), before tax:      
Changes in unrealized gains and losses on securities available-for-sale 18,860 (9,677) 25,287
Changes in unrealized gains and losses on derivative hedges 1,958 (5,232) (1,010)
Changes in unrealized gains and losses on terminated swaps 0 0 3,237
Changes in unrealized gains and losses on pension 515 (1,177) (2,308)
Total other comprehensive income (loss), before tax 21,333 (16,086) 25,206
Income taxes related to other comprehensive income (loss):      
Changes in unrealized gains and losses on securities available-for-sale (7,199) 3,640 (9,595)
Changes in unrealized gains and losses on derivative hedges (835) 2,094 407
Changes in unrealized gains and losses on terminated swaps 0 0 (1,312)
Changes in unrealized gains and losses on pension (228) 468 930
Total income tax (expense) benefit related to other comprehensive income (loss) (8,262) 6,202 (9,570)
Total other comprehensive income (loss) 13,071 (9,884) 15,636
Total comprehensive income $ 71,741 $ 39,634 $ 49,380