Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income	$ 23,262	$ 17,835
Other comprehensive income (loss), net of tax:
Net unrealized gains on investment securities available-for-sale, net of tax expense of $1,470 and $1,262 for the three months ended March 31, 2016 and 2015, respectively	2,729	2,344
Reclassification adjustment for realized gain on sale of investment securities available-for-sale included in net income, net of tax expense of $7 and $203 for the three months ended March 31, 2016 and 2015, respectively.	(12)	(376)
Adjustment for pension and other postretirement benefits, net of tax expense (benefit) of $(202) and $381 for the three months ended March 31, 2016 and 2015, respectively	(375)	706
Total other comprehensive income (loss), net of tax	2,342	2,674
Comprehensive income	$ 25,604	$ 20,509