Regulatory Matters - Schedule of Actual and Required Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Regulatory Matters
Tier-1 Leverage	$ 48,891	$ 47,838
Tier 1 Leverage, ratio (as a percent)	11.83%	11.39%
Common Equity Tier 1	$ 48,891	$ 47,838
Common Equity Tier 1, ratio (as a percent)	18.14%	18.63%
Tier 1	$ 48,891	$ 47,838
Tier 1, ratio (as a percent)	18.14%	18.63%
Total Capital	$ 52,123	$ 51,059
Total Capital, ratio (as a percent)	19.34%	19.88%
Leverage required for capital adequacy purposes	$ 16,538	$ 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	$ 18,605	$ 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	$ 24,807	$ 15,409
Tier 1 required for capital adequacy purposes, ratio (as a percent)	6.00%	6.00%
Total capital required for capital adequacy purposes	$ 33,076	$ 20,545
Total capital required for capital adequacy purposes, ratio (as a percent)	8.00%	8.00%