Regulatory Matters - Schedule of Actual and Required Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Regulatory Matters
Tier-1 Leverage	$ 47,993	$ 43,954
Tier 1 Leverage, ratio (as a percent)	11.07%	10.60%
Common Equity Tier 1	$ 47,993	$ 43,954
Common Equity Tier 1, ratio (as a percent)	18.15%	15.36%
Tier 1	$ 47,993	$ 43,954
Tier 1, ratio (as a percent)	18.15%	15.36%
Total Capital	$ 51,310	$ 47,544
Total Capital, ratio (as a percent)	19.41%	16.62%
Leverage required for capital adequacy purposes	$ 17,342	$ 16,594
Leverage required for capital adequacy purposes, ratio (as a percent)	4.00%	4.00%
Common Equity Tier 1 required for capital adequacy purposes	$ 11,897	$ 12,875
Common Equity Tier 1 required for capital adequacy purposes, ratio (as a percent)	4.50%	4.50%
Tier 1 required for capital adequacy purposes	$ 15,862	$ 17,166
Tier 1 required for capital adequacy purposes, ratio (as a percent)	6.00%	6.00%
Total capital required for capital adequacy purposes	$ 21,150	$ 22,888
Total capital required for capital adequacy purposes, ratio (as a percent)	8.00%	8.00%