Off Balance Sheet Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Off Balance Sheet Risk
Contract amounts representing credit risk	$ 284,049	$ 276,343
Commitments to extend credit
Off Balance Sheet Risk
Contract amounts representing credit risk	270,275	263,487
Standby letters of credit
Off Balance Sheet Risk
Contract amounts representing credit risk	$ 7,311	6,515
Coverage period for instrument (in years)	1 year
Credit exposure from the sale of assets with recourse
Off Balance Sheet Risk
Contract amounts representing credit risk	$ 6,463	$ 6,341