Loans and Allowance for Credit Losses on Loans - Aging of Past Due Loans by Class of Loans (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 9,516,000	$ 6,229,000
Current	2,823,350,000	2,619,758,000
Total loan balance	2,832,866,000	2,625,987,000
30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	5,784,000	4,657,000
60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,196,000	744,000
90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	2,536,000	828,000
Commercial
Aging of Past Due Loans by Class of Loans
Total loan balance	844,147,000	846,386,000
Commercial | Commercial
Aging of Past Due Loans by Class of Loans
Total Past Due	5,915,000	4,175,000
Current	838,232,000	842,211,000
Total loan balance	844,147,000	846,386,000
Commercial | Commercial | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	4,467,000	3,524,000
Commercial | Commercial | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,187,000	259,000
Commercial | Commercial | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	261,000	392,000
CRE - owner occupied
Aging of Past Due Loans by Class of Loans
Total loan balance	583,091,000	560,362,000
CRE - owner occupied | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	2,324,000	1,162,000
Current	580,767,000	559,200,000
Total loan balance	583,091,000	560,362,000
CRE - owner occupied | Real estate | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,172,000	1,133,000
CRE - owner occupied | Real estate | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	9,000
CRE - owner occupied | Real estate | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,143,000	29,000
CRE - non-owner occupied
Aging of Past Due Loans by Class of Loans
Total loan balance	742,135,000	693,103,000
CRE - non-owner occupied | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	870,000	485,000
Current	741,265,000	692,618,000
Total loan balance	742,135,000	693,103,000
CRE - non-owner occupied | Real estate | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	145,000
CRE - non-owner occupied | Real estate | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due		485,000
CRE - non-owner occupied | Real estate | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	725,000
Land and construction
Aging of Past Due Loans by Class of Loans
Total loan balance	129,426,000	144,594,000
Land and construction | Real estate
Aging of Past Due Loans by Class of Loans
Current	129,426,000	144,594,000
Total loan balance	129,426,000	144,594,000
Home equity
Aging of Past Due Loans by Class of Loans
Total loan balance	107,873,000	111,885,000
Home equity | Real estate
Aging of Past Due Loans by Class of Loans
Current	107,873,000	111,885,000
Total loan balance	107,873,000	111,885,000
Multi-family
Aging of Past Due Loans by Class of Loans
Total loan balance	198,771,000	166,425,000
Multi-family | Real estate
Aging of Past Due Loans by Class of Loans
Current	198,771,000	166,425,000
Total loan balance	198,771,000	166,425,000
Residential mortgages
Aging of Past Due Loans by Class of Loans
Total loan balance	205,904,000	85,116,000
Residential mortgages | Real estate
Aging of Past Due Loans by Class of Loans
Current	205,904,000	85,116,000
Total loan balance	205,904,000	85,116,000
Consumer and other
Aging of Past Due Loans by Class of Loans
Total loan balance	21,519,000	18,116,000
Consumer and other | Consumer
Aging of Past Due Loans by Class of Loans
Total Past Due	407,000	407,000
Current	21,112,000	17,709,000
Total loan balance	21,519,000	18,116,000
Consumer and other | Consumer | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 407,000	$ 407,000