Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 5,068	$ 4,515
Less: accumulated depreciation and amortization	2,374	1,969
Total premises and equipment, net	2,694	2,546
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,614	1,614
Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,975	2,889
Construction in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 479	$ 12