Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$ 17,835	$ 13,813
Other comprehensive income (loss), net of tax:
Net unrealized gains on investment securities available-for-sale, net of tax expense of $1,262 and $857 for the three months ended March 31, 2015 and 2014, respectively	2,344	1,593
Reclassification adjustment for realized gain on sale of investment securities available-for-sale included in net income, net of tax expense of $203 for the three months ended March 31, 2015	(376)	0
Adjustment for pension and other postretirement benefits, net of tax expense (benefit) of $381 and $(201) for the three months ended March 31, 2015 and 2014, respectively	706	(374)
Total other comprehensive income (loss), net of tax	2,674	1,219
Comprehensive income	$ 20,509	$ 15,032