Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Common equity tier 1 capital to risk weighted assets
Actual	$ 269,874	$ 251,477
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 157,821	$ 158,020
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	11.97%	11.14%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	7.00%	7.00%
Total capital to risk weighted assets, Amount
Actual at period end	$ 323,041	$ 327,886
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 236,701	$ 236,944
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	14.33	14.53
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	10.500	10.500
Tier 1 capital to risk weighted assets, Amount
Actual	$ 294,874	$ 308,102
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 191,623	$ 191,858
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	13.08	13.65
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	8.500	8.500
Tier 1 capital to average assets, Amount
Actual	$ 294,874	$ 308,102
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 117,130	$ 103,303
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	10.07	11.93
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	4.00	4.00
Subsidiaries [Member]
Common equity tier 1 capital to risk weighted assets
Actual	$ 319,662	$ 322,496
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	157,137	157,315
Minimum Required to Be Well Capitalized	$ 145,913	$ 146,078
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	14.24%	14.35%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	7.00%	7.00%
Minimum Required to Be Well Capitalized (as a percent)	6.50%	6.50%
Total capital to risk weighted assets, Amount
Actual at period end	$ 347,723	$ 342,280
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	235,706	235,978
Minimum Required to Be Well Capitalized	$ 224,482	$ 224,741
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	15.49	15.23
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	10.500	10.500
Minimum Required to Be Well Capitalized (as a percent)	10.00	10.00
Tier 1 capital to risk weighted assets, Amount
Actual	$ 319,662	$ 322,496
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	190,809	191,026
Minimum Required to Be Well Capitalized	$ 179,585	$ 179,789
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	14.24	14.35
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	8.500	8.500
Minimum Required to Be Well Capitalized (as a percent)	8.00	8.00
Tier 1 capital to average assets, Amount
Actual	$ 319,662	$ 322,496
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	117,307	103,199
Minimum Required to Be Well Capitalized	$ 146,634	$ 128,998
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	10.90	12.50
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	4.00	4.00
Minimum Required to Be Well Capitalized (as a percent)	5.00	5.00