Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 13,232	$ 10,607	$ 37,476	$ 40,582
Unrealized gains (losses) on available-for-sale securities arising during the period	1,427	2,111	11,575	3,079
Reclassification adjustment for gains	(2,668)	0	(3,513)	(2,130)
Other comprehensive income (loss) before income taxes	(1,241)	2,111	8,062	949
Tax effect	458	(779)	(2,976)	(350)
Other comprehensive income (loss), net of tax	(783)	1,332	5,086	599
Comprehensive Income, Net of Tax	$ 12,449	$ 11,939	$ 42,562	$ 41,181