Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Beginning Balance			$ 105,506	$ 102,492
Total other comprehensive income, net of tax	$ 1,504	$ 855	2,895	5,943
Ending Balance	109,520	108,951	109,520	108,951
AOCI Attributable to Parent [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Beginning Balance			5,830	4,584
Total other comprehensive income, net of tax			2,895	5,943
Ending Balance	8,725	$ 10,527	8,725	$ 10,527
Unrealized Gains on Available-for-Sale Securities [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Beginning Balance			5,830
Other comprehensive income before reclassifications			4,727
Amounts reclassified from accumulated other comprehensive income			(1,832)
Total other comprehensive income, net of tax			2,895
Ending Balance	$ 8,725		$ 8,725