Regulatory Capital - Schedule of actual amount and capital ratios of company and bank (Details) - Bank $ in Thousands	Sep. 30, 2020 USD ($)
Total Capital to Risk Weighted Assets
Total capital to risk weighted assets, actual capital amount	$ 178,100
Total capital to risk weighted assets, actual capital ratio	0.160
Total capital to risk weighted assets, for capital adequacy purposes, amount	$ 149,643
Total capital to risk weighted assets to be categorized as well-capitalized, amount	111,425
Tier 1 capital to risk weighted assets
Tier 1 capital to risk weighted assets, actual capital amount	$ 164,124
Tier 1 capital to risk weighted asset, actual capital ratio	0.147
Tier 1 risk based capital required for capital adequacy	$ 73,819
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, amount	89,140
Tier 1 Capital to Average Assets
Tier 1 capital to average assets, actual capital amount	$ 164,124
Tier 1 capital to average asset, actual capital ratio	0.095
Tier 1 capital to average assets, for capital adequacy purposes, amount	$ 69,400
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, amount	$ 86,750
Minimum
Total Capital to Risk Weighted Assets
Total capital to risk weighted assets, for capital adequacy purposes, ratio	0.08625
Total capital to risk weighted assets to be categorized as well-capitalized, ratio	0.100
Tier 1 capital to risk weighted assets
Tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio	0.06625
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, ratio	0.080
Tier 1 Capital to Average Assets
Tier 1 capital to average assets, for capital adequacy purposes, ratio	0.040
Tier 1 leverage capital required to be well capitalized to average assets	0.050
Common stock
Tier 1 capital to risk weighted assets
Tier 1 capital to risk weighted assets, actual capital amount	$ 164,124
Tier 1 capital to risk weighted asset, actual capital ratio	0.147
Tier 1 risk based capital required for capital adequacy	$ 57,105
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, amount	$ 72,426
Common stock | Minimum
Tier 1 capital to risk weighted assets
Tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio	0.05125
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, ratio	0.065