Property, Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Premises and Equipment
Total cost	$ 47,223	$ 46,335
Less: accumulated depreciation and amortization	11,158	8,993
Total property, premises and equipment	36,065	37,342
Depreciation expense	2,217	2,068	$ 1,829
Building and improvements
Property, Premises and Equipment
Total cost	27,176	27,160
Land
Property, Premises and Equipment
Total cost	11,543	11,543
Furniture and equipment
Property, Premises and Equipment
Total cost	7,619	7,213
Construction in progress
Property, Premises and Equipment
Total cost	$ 885	$ 419