Regulatory Capital Matters - Summary of Actual and Required Capital Amounts and Ratios, Exclusive of Capital Conservation Buffer (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), Actual Amount	$ 155,287	$ 150,092
Tier 1 capital (to risk-weighted assets), Actual Amount	142,147	139,975
Common equity Tier 1 capital (to risk-weighted assets), Actual Amount	142,147	139,975
Tier 1 capital (to average assets), Actual Amount	$ 142,147	$ 139,975
Total capital (to risk-weighted assets), Actual Ratio	0.1481	0.1518
Tier 1 capital (to risk-weighted assets), Actual Ratio	0.1356	0.1416
Common equity Tier 1 capital (to risk-weighted assets), Actual Ratio	0.1356	0.1416
Tier 1 capital (to average assets), Actual Ratio	0.1055	0.1214
Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), Actual Amount	$ 152,232	$ 147,820
Tier 1 capital (to risk-weighted assets), Actual Amount	139,092	137,703
Common equity Tier 1 capital (to risk-weighted assets), Actual Amount	139,092	137,703
Tier 1 capital (to average assets), Actual Amount	$ 139,092	$ 137,703
Total capital (to risk-weighted assets), Actual Ratio	0.1452	0.1496
Tier 1 capital (to risk-weighted assets), Actual Ratio	0.1327	0.1393
Common equity Tier 1 capital (to risk-weighted assets), Actual Ratio	0.1327	0.1393
Tier 1 capital (to average assets), Actual Ratio	0.1032	0.1195
Total capital (to risk-weighted assets), Amount, Required for Capital Adequacy Purposes	$ 83,859	$ 79,069
Tier 1 capital (to risk-weighted assets), Amount, Required for Capital Adequacy Purposes	62,894	59,301
Common equity Tier 1 capital (to risk-weighted assets), Amount, Required for Capital Adequacy Purposes	47,171	44,476
Tier 1 capital (to average assets), Amount, Required for Capital Adequacy Purposes	$ 53,915	$ 46,103
Total capital (to risk-weighted assets), Ratio, Required for Capital Adequacy Purposes	0.0800	0.0800
Tier 1 capital (to risk-weighted assets), Ratio, Required for Capital Adequacy Purposes	0.0600	0.0600
Common equity Tier 1 capital (to risk-weighted assets), Ratio, Required for Capital Adequacy Purposes	0.0450	0.0450
Tier 1 capital (to average assets), Ratio, Required for Capital Adequacy Purposes	0.0400	0.0400
Total capital (to risk-weighted assets), Amount, Minimum To be Considered "Well Capitalized"	$ 104,824	$ 98,836
Tier 1 capital (to risk-weighted assets), Amount, Minimum To be Considered "Well Capitalized"	83,859	79,069
Common equity Tier 1 capital (to risk-weighted assets), Amount, Minimum To be Considered "Well Capitalized"	68,136	64,243
Tier 1 capital (to average assets), Amount, Minimum To be Considered "Well Capitalized"	$ 67,393	$ 57,629
Total capital (to risk-weighted assets), Ratio, Minimum To be Considered "Well Capitalized"	0.1000	0.1000
Tier 1 capital (to risk-weighted assets), Ratio, Minimum To be Considered "Well Capitalized"	0.0800	0.0800
Common equity Tier 1 capital (to risk-weighted assets), Ratio, Minimum To be Considered "Well Capitalized"	0.0650	0.0650
Tier 1 capital (to average assets), Ratio, Minimum To be Considered "Well Capitalized"	0.0500	0.0500