Regulatory Capital - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Total capital (to risk weighted assets)
Actual, Amount	$ 280,891	$ 283,471
Actual, Ratio	0.157	0.156
Minimum Capital Requirements, Amount	$ 188,433	$ 190,798
Minimum Capital Requirements, Ratio	0.105	0.105
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 179,460	$ 181,712
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100	0.100
Tier 1 capital (to risk weighted assets)
Actual, Amount	$ 261,666	$ 262,960
Actual, Ratio	0.146	0.144
Minimum Capital Requirements, Amount	$ 152,541	$ 155,219
Minimum Capital Requirements, Ratio	0.085	0.085
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 143,568	$ 146,089
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080	0.080
Common equity tier 1 capital (to risk weighted assets)
Actual, Amount	$ 261,666	$ 262,960
Actual, Ratio	0.146	0.144
Minimum Capital Requirements, Amount	$ 125,622	$ 127,828
Minimum Capital Requirements, Ratio	0.070	0.070
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 116,649	$ 118,697
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.065	0.065
Tier 1 capital (to average assets)
Actual, Amount	$ 261,666	$ 262,960
Actual, Ratio	0.113	0.113
Minimum Capital Requirements, Amount	$ 92,625	$ 93,083
Minimum Capital Requirements, Ratio	0.040	0.040
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 115,781	$ 116,354
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.050	0.050