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