Loans and Allowance for Credit Losses on Loans - Aging of Past Due Loans by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 9,062	$ 6,229
Current	2,829,526	2,619,758
Total loan balance	2,838,588	2,625,987
30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	5,673	4,657
60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,070	744
90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	2,319	828
Commercial
Aging of Past Due Loans by Class of Loans
Total loan balance	743,450	846,386
Commercial | Commercial
Aging of Past Due Loans by Class of Loans
Total Past Due	6,466	4,175
Current	736,984	842,211
Total loan balance	743,450	846,386
Commercial | Commercial | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	5,105	3,524
Commercial | Commercial | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,070	259
Commercial | Commercial | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	291	392
CRE - owner occupied
Aging of Past Due Loans by Class of Loans
Total loan balance	580,624	560,362
CRE - owner occupied | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	1,704	1,162
Current	578,920	559,200
Total loan balance	580,624	560,362
CRE - owner occupied | Real estate | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	568	1,133
CRE - owner occupied | Real estate | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,136	29
CRE - non-owner occupied
Aging of Past Due Loans by Class of Loans
Total loan balance	829,022	693,103
CRE - non-owner occupied | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	485	485
Current	828,537	692,618
Total loan balance	829,022	693,103
CRE - non-owner occupied | Real estate | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due		485
CRE - non-owner occupied | Real estate | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	485
Land and construction
Aging of Past Due Loans by Class of Loans
Total loan balance	141,277	144,594
Land and construction | Real estate
Aging of Past Due Loans by Class of Loans
Current	141,277	144,594
Total loan balance	141,277	144,594
Home equity
Aging of Past Due Loans by Class of Loans
Total loan balance	106,690	111,885
Home equity | Real estate
Aging of Past Due Loans by Class of Loans
Current	106,690	111,885
Total loan balance	106,690	111,885
Multi-family
Aging of Past Due Loans by Class of Loans
Total loan balance	205,952	166,425
Multi-family | Real estate
Aging of Past Due Loans by Class of Loans
Current	205,952	166,425
Total loan balance	205,952	166,425
Residential mortgages
Aging of Past Due Loans by Class of Loans
Total loan balance	211,467	85,116
Residential mortgages | Real estate
Aging of Past Due Loans by Class of Loans
Current	211,467	85,116
Total loan balance	211,467	85,116
Consumer and other
Aging of Past Due Loans by Class of Loans
Total loan balance	20,106	18,116
Consumer and other | Consumer
Aging of Past Due Loans by Class of Loans
Total Past Due	407	407
Current	19,699	17,709
Total loan balance	20,106	18,116
Consumer and other | Consumer | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 407	$ 407