Off Balance Sheet Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Off Balance Sheet Risk
Contract amounts representing credit risk	$ 156,857	$ 183,135
Commitments to extend credit
Off Balance Sheet Risk
Contract amounts representing credit risk	140,732	166,417
Standby letters of credit
Off Balance Sheet Risk
Contract amounts representing credit risk	$ 9,883	10,566
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	$ 6,242	$ 6,152