Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 6,698	$ 3,463	$ 18,417	$ 9,662
Other comprehensive income (loss):
Change in net actuarial gain	26	40	78	122
Tax effect on change in net actuarial gain	(9)	(14)	(27)	(43)
Unrealized holding (losses) gains arising during the period	(10,821)	(221)	(7,858)	1,900
Tax effect on unrealized holding (losses) gains arising during the period	3,787	77	2,750	(665)
Reclassification adjustment for (gains) losses included in net income	(28)	23	(5,881)	122
Tax effect on reclassification adjustment for gains (losses) included in net income	10	(8)	2,058	(43)
Other comprehensive (loss) income, net of tax	(7,035)	(103)	(8,880)	1,393
Comprehensive (loss) income	$ (337)	$ 3,360	$ 9,537	$ 11,055