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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net income $ 23,126 $ 20,124
Other comprehensive income (loss), before tax:    
Change in net unrealized gains/losses during period 9,354 8,613
Reclassification adjustment for net (gains) losses included in income (2) 21
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity 463 465
Unrealized loss on derivatives 49 (2,197)
Defined benefit post-retirement benefits plans:    
Change in net actuarial loss (739) 15
Other comprehensive income (loss), before tax 9,125 6,917
Deferred tax benefit (expense) related to other comprehensive income (3,590) (2,722)
Other comprehensive income (loss), net of tax 5,535 4,195
Comprehensive income, net of tax $ 28,661 $ 24,319