Capital and Regulatory Matters - Schedule of Actual and Required Capital Amounts and Ratios - Basel III and Dodd Frank Rules (Details) - Corrective Action Rules - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Basel III and Dodd Frank Rules
Tier 1 Leverage required to be Well Capitalized	$ 20,997	$ 20,742
Tier 1 Leverage required to be Well Capitalized (as a percent)	5.00%	5.00%
Common Equity Tier I required to be Well Capitalized	$ 16,693	$ 18,597
Common Equity Tier I required to be Well Capitalized (as a percent)	6.50%	6.50%
Tier I Capital required to be Well Capitalized	$ 20,545	$ 22,888
Tier I Capital required to be Well Capitalized (as a percent)	8.00%	8.00%
Total Capital required to be Well Capitalized	$ 25,681	$ 28,610
Total Capital required to be Well Capitalized (as a percent)	10.00%	10.00%