Premises and Equipment - Net Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 29,088	$ 29,663
Less accumulated depreciation and amortization	(14,746)	(14,408)
Premises and equipment, net	14,342	15,255
Depreciation expense	1,339	1,325
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,564	2,560
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	6,075	6,075
Building improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	12,015	11,985
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	7,011	7,446
Software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,221	1,507
Automobiles
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	66	81
Construction in progress
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 136	$ 9