Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements of Comprehensive Income
Net income	$ 40,569	$ 29,688	$ 72,573	$ 62,672
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on securities available for sale arising during period (net of tax effects of $2,894, $5,451, $10,092, and $20,705)	5,374	10,124	18,742	38,452
Reclassification adjustment for losses on securities available for sale included in net income (net of tax effects of $889, $79, $564, and $126)	1,650	148	1,048	234
Reclassification adjustment for impairment charges on available for sale securities included in net income (net of tax effects of $-, $23, $-, and $67)		44		124
Other comprehensive (loss) income, net of tax	7,024	10,316	19,790	38,810
Comprehensive income	$ 47,593	$ 40,004	$ 92,363	$ 101,482