Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statements of Comprehensive Income
Net income	$ 52,887	$ 40,569	$ 106,307	$ 72,573
Other comprehensive income, net of tax:
Net unrealized holding (losses) gains on securities available for sale arising during period (net of tax effects of $(2,974), $2,894, $(13,594) and $10,092)	(11,187)	5,374	(51,140)	18,742
Reclassification adjustment for losses on securities available for sale included in net income (net of tax effects of $0, $889, $0 and $564)		1,650		1,048
Other comprehensive income, net of tax	(11,187)	7,024	(51,140)	19,790
Comprehensive income	$ 41,700	$ 47,593	$ 55,167	$ 92,363