Premises and Equipment - Summary of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 18,142	$ 17,532
Less: Accumulated depreciation	9,979	9,871
Premises and equipment, net	8,163	7,661
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,408	1,408
Building [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	10,044	9,341
Leasehold and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	661	661
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 6,029	$ 6,122