Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 12,694	$ 11,366	$ 8,336	$ 5,650	$ 8,234	$ 4,859	$ 7,365	$ 32,396	$ 20,458
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available for sale securities arising during the period	2,316				(398)			(429)	(77)
Change in minimum pension liability	112				6			334	16
Other comprehensive income (loss)	2,428				(392)			(95)	(61)
Comprehensive income	$ 15,122				$ 7,842			$ 32,301	$ 20,397