Regulatory Capital Matters (Details)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Common equity tier 1 to risk-weighted assets:
Actual capital, amount	$ 133,858,000	$ 157,659,000
Actual capital, ratio	0.0876	0.1172
Required capital adequacy, amount	$ 68,786,000	$ 60,533,000
Required capital adequacy, ratio	4.50%	4.50%
Required capital adequacy with capital conservation buffer, amount	$ 107,001,000	$ 94,163,000
Required capital adequacy with capital conservation buffer, ratio	7.00%	7.00%
Tier 1 capital to risk-weighted assets:
Actual capital, amount	$ 133,858,000	$ 157,659,000
Actual capital, ratio	0.0876	0.1172
Required capital adequacy, amount	$ 91,715,000	$ 80,711,000
Required capital adequacy, ratio	0.0600	0.0600
Required capital adequacy with capital conservation buffer, amount	$ 129,930,000	$ 114,341,000
Required capital adequacy, ratio	8.50%	8.50%
Total capital to risk-weighted assets:
Actual capital, amount	$ 195,850,000	$ 215,091,000
Actual capital, ratio	0.1281	0.1599
Required capital adequacy, amount	$ 122,287,000	$ 107,615,000
Required capital adequacy, ratio	0.0800	0.0800
Required capital adequacy with capital conservation buffer, amount	$ 160,501,000	$ 141,244,000
Required capital adequacy, ratio	10.50%	10.50%
Tier 1 capital to average assets (leverage ratio):
Actual capital, amount	$ 133,858,000	$ 157,659,000
Actual capital, ratio	0.0621	0.1041
Required capital adequacy, amount	$ 86,249,000	$ 60,580,000
Required capital adequacy, ratio	0.0400	0.0400
Required capital adequacy with capital conservation buffer, amount	$ 86,249,000	$ 60,580,000
Required capital adequacy with capital conservation buffer, ratio	4.00%	4.00%
Capital conservation buffer, percentage	2.50%	2.50%
Amount available for dividend payment without regulatory approval	$ 32,500,000
Bank
Common equity tier 1 to risk-weighted assets:
Actual capital, amount	$ 175,391,000	$ 165,199,000
Actual capital, ratio	0.1148	0.1227
Required capital adequacy, amount	$ 68,763,000	$ 60,568,000
Required capital adequacy, ratio	4.50%	4.50%
Required capital adequacy with capital conservation buffer, amount	$ 106,965,000	$ 94,217,000
Required capital adequacy with capital conservation buffer, ratio	7.00%	7.00%
Prompt corrective action provisions, amount	$ 99,324,000	$ 87,487,000
Prompt corrective action provisions, ratio	6.50%	6.50%
Tier 1 capital to risk-weighted assets:
Actual capital, amount	$ 175,391,000	$ 165,199,000
Actual capital, ratio	0.1148	0.1227
Required capital adequacy, amount	$ 91,684,000	$ 80,757,000
Required capital adequacy, ratio	0.0600	0.0600
Required capital adequacy with capital conservation buffer, amount	$ 129,886,000	$ 114,406,000
Required capital adequacy, ratio	8.50%	8.50%
Prompt corrective action provisions, amount	$ 122,245,000	$ 107,676,000
Prompt corrective action provisions, ratio	0.0800	0.0800
Total capital to risk-weighted assets:
Actual capital, amount	$ 192,926,000	$ 178,191,000
Actual capital, ratio	0.1263	0.1324
Required capital adequacy, amount	$ 122,245,000	$ 107,676,000
Required capital adequacy, ratio	0.0800	0.0800
Required capital adequacy with capital conservation buffer, amount	$ 160,447,000	$ 141,325,000
Required capital adequacy, ratio	10.50%	10.50%
Prompt corrective action provisions, amount	$ 152,807,000	$ 134,595,000
Prompt corrective action provisions, ratio	0.1000	0.1000
Tier 1 capital to average assets (leverage ratio):
Actual capital, amount	$ 175,391,000	$ 165,199,000
Actual capital, ratio	0.0817	0.1096
Required capital adequacy, amount	$ 85,879,000	$ 60,276,000
Required capital adequacy, ratio	0.0400	0.0400
Required capital adequacy with capital conservation buffer, amount	$ 85,879,000	$ 60,276,000
Required capital adequacy with capital conservation buffer, ratio	4.00%	4.00%
Prompt corrective action provisions, amount	$ 107,349,000	$ 75,345,000
Prompt corrective action provisions, ratio	0.0500	0.0500