Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Consolidated Statements of Comprehensive Income
Net income	$ 32,984	$ 35,862
Other comprehensive (loss) income, net of tax:
Net unrealized holding (losses) gains on securities available for sale arising during period (net of tax effects of $15,254 and $11,756)	28,328	21,833
Reclassification adjustment for losses (gains) on securities available for sale included in net income (net of tax effects of $47 and $(-))	86	(1)
Reclassification adjustment for impairment charges on available for sale securities included in net income (net of tax effects of $43 and $79)	81	148
Other comprehensive (loss) income, net of tax	28,495	21,980
Comprehensive income	$ 61,479	$ 57,842