Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income	$ 25,193	$ 20,162	$ 70,871	$ 63,364
Other comprehensive income (loss), before tax:
Change in net unrealized gains/losses during period	(3,430)	10,855	15,241	12,264
Reclassification adjustment for net (gains) losses included in income	(225)	(23)	(312)	(75)
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	490	448	1,394	1,353
Unrealized loss on derivatives	512	(436)	(2,490)	(436)
Defined benefit post-retirement benefits plans:
Change in net actuarial loss	15	15	43	43
Other comprehensive income (loss), before tax	(2,638)	10,859	13,876	13,149
Deferred tax benefit (expense) related to other comprehensive income	1,038	(4,273)	(5,460)	(5,174)
Other comprehensive income (loss), net of tax	(1,600)	6,586	8,416	7,975
Comprehensive income, net of tax	$ 23,593	$ 26,748	$ 79,287	$ 71,339