Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 19,024	$ 16,236	$ 36,859	$ 30,049
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on investment securities available-for-sale, net of tax expense (benefit) of $(1,084) and $909 for the three months ended June 30, 2015 and 2014, respectively, and $177 and $1,766 for the six months ended June 30, 2015 and 2014, respectively	(2,014)	1,687	331	3,280
Reclassification adjustment for realized gain on sale of investment securities available-for-sale included in net income, net of tax expense of $10 for the three months ended June 30, 2015 and $212 for the six months ended June 30, 2015	(18)	0	(395)	0
Adjustment for pension and other postretirement benefits, net of tax expense (benefit) of $380 and $(202) for the three months ended June 30, 2015 and 2014, respectively, and $761 and $(403) for the six months ended June 30, 2015 and 2014, respectively	707	(374)	1,413	(748)
Total other comprehensive income (loss), net of tax	(1,325)	1,313	1,349	2,532
Comprehensive income	$ 17,699	$ 17,549	$ 38,208	$ 32,581