Regulatory Matters - Schedule of Regulatory Capital (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Total capital to risk-weighted assets: Amount
Actual	$ 64,463	$ 64,221
For capital adequacy purposes	39,797	39,630
To be well capitalized	49,746	49,537
Tier 1 capital to risk-weighted assets: Amount
Actual	58,528	58,088
For capital adequacy purposes	29,848	29,722
To be well capitalized	39,797	39,630
Common Equity Tier 1 capital to risk-weighted assets: Amount
Actual	58,528	58,088
For capital adequacy purposes	22,386	22,292
To be well capitalized	32,335	32,199
Tier 1 capital to average assets: Amount
Actual	58,528	58,088
For capital adequacy purposes	29,571	30,117
To be well capitalized	$ 36,964	$ 37,647
Total capital to risk-weighted assets: Ratio
Actual	12.96%	12.96%
For capital adequacy purposes	8.00%	8.00%
To be well capitalized	10.00%	10.00%
Tier 1 capital to risk-weighted assets: Ratios
Actual	11.77%	11.73%
For capital adequacy purposes	6.00%	6.00%
To be well capitalized	8.00%	8.00%
Common Equity Tier 1 capital to risk-weighted assets: Ratio
Actual	11.77%	11.73%
For capital adequacy purposes	4.50%	4.50%
To be well capitalized	6.50%	6.50%
Tier 1 capital to average assets: Ratio
Actual	7.92%	7.71%
For capital adequacy purposes	4.00%	4.00%
To be well capitalized	5.00%	5.00%