Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 25,554	$ 22,222	$ 45,678	$ 43,202
Other comprehensive income (loss), before tax:
Change in net unrealized gains/losses during period	10,043	(9,196)	18,671	1,412
Reclassification adjustment for net (gains) losses included in income	(108)	(46)	(87)	(52)
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	452	451	904	902
Unrealized loss on derivatives	(804)	0	(3,002)	0
Defined benefit post-retirement benefits plans:
Change in net actuarial loss	13	13	28	28
Other comprehensive income (loss), before tax	9,596	(8,778)	16,514	2,290
Deferred tax benefit (expense) related to other comprehensive income	(3,775)	3,454	(6,498)	(901)
Other comprehensive income (loss), net of tax	5,821	(5,324)	10,016	1,389
Comprehensive income, net of tax	$ 31,375	$ 16,898	$ 55,694	$ 44,591