Regulatory Matters - Schedule of Actual and Required Capital Amounts and Ratios - Basel III and Dodd Frank Rules (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Basel III and Dodd Frank Rules
Tier 1 Leverage required to be Well Capitalized	$ 20,206	$ 20,997
Tier 1 Leverage required to be Well Capitalized (as a percent)	5.00%	5.00%
Common Equity Tier I required to be Well Capitalized	$ 16,450	$ 16,693
Common Equity Tier I required to be Well Capitalized (as a percent)	6.50%	6.50%
Tier I Capital required to be Well Capitalized	$ 20,246	$ 20,545
Tier I Capital required to be Well Capitalized (as a percent)	8.00%	8.00%
Total Capital required to be Well Capitalized	$ 25,308	$ 25,681
Total Capital required to be Well Capitalized (as a percent)	10.00%	10.00%