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	$ 14,264	$ 13,928	$ 42,561	$ 43,069
Other comprehensive income (loss):
Change in unrealized (depreciation) appreciation of available-for-sale securities	(905)	2,256	5,742	475
Reclassification adjustment for realized (gains) losses included in net income	(989)	0	(790)	(4)
Income tax effect	711	(847)	(1,859)	(177)
Other comprehensive (loss) income, net of tax	(1,183)	1,409	3,093	294
Comprehensive income	$ 13,081	$ 15,337	$ 45,654	$ 43,363