Regulatory Matters - Schedule of Actual and Required Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Regulatory Matters
Tier-1 Leverage	$ 47,751	$ 47,838
Tier 1 Leverage, ratio (as a percent)	11.98%	11.39%
Common Equity Tier 1	$ 47,751	$ 47,838
Common Equity Tier 1, ratio (as a percent)	18.02%	18.63%
Tier 1	$ 47,751	$ 47,838
Tier 1, ratio (as a percent)	18.02%	18.63%
Total Capital	$ 51,075	$ 51,059
Total Capital, ratio (as a percent)	19.28%	19.88%
Leverage required for capital adequacy purposes	$ 15,940	$ 16,798
Leverage required for capital adequacy purposes, ratio (as a percent)	4.00%	4.00%
Common Equity Tier 1 required for capital adequacy purposes	$ 11,923	$ 11,557
Common Equity Tier 1 required for capital adequacy purposes, ratio (as a percent)	4.50%	4.50%
Tier 1 required for capital adequacy purposes	$ 15,897	$ 15,409
Tier 1 required for capital adequacy purposes, ratio (as a percent)	6.00%	6.00%
Total capital required for capital adequacy purposes	$ 21,197	$ 20,545
Total capital required for capital adequacy purposes, ratio (as a percent)	8.00%	8.00%