Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 3,478	$ 4,002	$ 3,800	$ 4,069	$ 4,352	$ 3,429	$ 2,949	$ (1,765)	$ 15,349	$ 8,965	$ 10,841
Other comprehensive (loss) income, net of tax:
Unrealized holding (losses) gains on securities arising during the period									(164)	8,075	(8,565)
Reclassification for net gains on investments included in net income									(641)	(646)	(3,926)
Other comprehensive (loss) income, before income tax (benefit) expense									(805)	7,429	(12,491)
Income tax (benefit) expense related to items of other comprehensive income									(339)	3,072	(5,141)
Other comprehensive (loss) income									(466)	4,357	(7,350)
Comprehensive income									$ 14,883	$ 13,322	$ 3,491