Regulatory Matters - Schedule of Actual and Required Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Regulatory Matters
Tier-1 Leverage	$ 48,015	$ 47,838
Tier 1 Leverage, ratio (as a percent)	11.88%	11.39%
Common Equity Tier 1	$ 48,015	$ 47,838
Common Equity Tier 1, ratio (as a percent)	18.97%	18.63%
Tier 1	$ 48,015	$ 47,838
Tier 1, ratio (as a percent)	18.97%	18.63%
Total Capital	$ 51,192	$ 51,059
Total Capital, ratio (as a percent)	20.23%	19.88%
Leverage required for capital adequacy purposes	$ 16,165	$ 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	$ 11,389	$ 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	$ 15,185	$ 15,409
Tier 1 required for capital adequacy purposes, ratio (as a percent)	6.00%	6.00%
Total capital required for capital adequacy purposes	$ 20,246	$ 20,545
Total capital required for capital adequacy purposes, ratio (as a percent)	8.00%	8.00%