Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended							9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 8,234	$ 4,859	$ 7,365	$ 5,236	$ 7,361	$ 6,325	$ 8,477	$ 20,458	$ 22,163
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available for sale securities arising during the period	(398)				83			(77)	(2,027)
Change in minimum pension liability	6							16
Other comprehensive income (loss)	(392)				83			(61)	(2,027)
Comprehensive income	$ 7,842				$ 7,444			$ 20,397	$ 20,136