Regulatory Capital - Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 to Risk Weighted Assets, Capital Conservation Buffer, Phased in	2.50%
Common Equity Tier 1 to Risk Weighted Assets, Capital Conservation Buffer	2.50%
Total risk-based capital, Ratio	14.30%	13.30%
Tier 1 risk-based capital, Ratio	13.40%	12.40%
Tier 1 leverage capital, Ratio	11.30%	12.10%
CET 1 capital, Ratio	13.40%	12.40%
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, Amount	$ 209,535	$ 188,472
Total risk-based capital, Ratio	14.64%	13.52%
Total risk-based capital, For Capital Adequacy Purposes, Amount	$ 114,502	$ 111,493
Total risk-based capital, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total risk-based capital, For Capital Adequacy with Capital Buffer, Amount	$ 150,283	$ 137,694
Total risk-based capital, For Capital Adequacy with Capital Buffer, Ratio	10.50%	9.88%
Total risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 143,127	$ 139,366
Total risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 risk-based capital, Amount	$ 196,013	$ 175,824
Tier 1 risk-based capital, Ratio	13.70%	12.62%
Tier 1 risk-based capital, For Capital Adequacy Purposes, Amount	$ 85,876	$ 83,620
Tier 1 risk-based capital, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 risk-based capital, For Capital Adequacy with Capital Buffer, Amount	$ 121,658	$ 109,820
Tier 1 risk-based capital, For Capital Adequacy with Capital Buffer, Ratio	8.50%	7.88%
Tier 1 risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 114,502	$ 111,493
Tier 1 risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Tier 1 leverage capital	$ 196,013	$ 175,824
Tier 1 leverage capital, Ratio	11.56%	10.67%
Tier 1 leverage capital, For Capital Adequacy Purposes, Amount	$ 67,808	$ 65,884
Tier 1 leverage capital, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 leverage capital, For Capital Adequacy with Capital Buffer, Amount	$ 0	$ 0
Tier 1 leverage capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 84,761	$ 82,355
Tier 1 leverage capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
CET 1 capital, Amount	$ 196,013	$ 175,824
CET 1 capital, Ratio	13.70%	12.62%
CET 1 capital, For Capital Adequacy Purposes, Amount	$ 64,407	$ 62,715
CET 1 capital, For Capital Adequacy Purposes, Ratio	4.50%	4.50%
CET 1 capital, For Capital Adequacy with Capital Buffer, Amount	$ 100,189	$ 88,846
CET 1 capital, For Capital Adequacy with Capital Buffer, Ratio	7.00%	6.38%
CET 1 capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 93,033	$ 90,588
CET 1 capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%