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Loans and Allowance for Credit Losses on Loans - Aging of Past Due Loans by Class of Loans (Details) - USD ($)	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 6,229,000		$ 15,315,000
Current	2,619,758,000		2,518,848,000
Total loan balance	2,625,987,000	$ 31,855,000	2,534,163,000
30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	4,657,000		4,770,000
60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	744,000		2,234,000
90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	828,000		8,311,000
Commercial
Aging of Past Due Loans by Class of Loans
Total loan balance			603,345,000
Real estate
Aging of Past Due Loans by Class of Loans
Total loan balance			1,897,074,000
Consumer
Aging of Past Due Loans by Class of Loans
Total loan balance			33,744,000
Commercial
Aging of Past Due Loans by Class of Loans
Total Past Due			10,084,000
Current			593,261,000
Total loan balance	846,386,000	6,790,000	603,345,000
Commercial | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due			4,770,000
Commercial | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due			2,097,000
Commercial | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due			3,217,000
Commercial | Commercial
Aging of Past Due Loans by Class of Loans
Total Past Due	4,175,000
Current	842,211,000
Total loan balance	846,386,000		603,345,000
Commercial | Commercial | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	3,524,000
Commercial | Commercial | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	259,000
Commercial | Commercial | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	392,000
CRE - owner occupied
Aging of Past Due Loans by Class of Loans
Total Past Due			5,094,000
Current			543,813,000
Total loan balance	560,362,000	6,994,000	548,907,000
CRE - owner occupied | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due			5,094,000
CRE - owner occupied | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	1,162,000
Current	559,200,000
Total loan balance	560,362,000		548,907,000
CRE - owner occupied | Real estate | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,133,000
CRE - owner occupied | Real estate | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	29,000
CRE - non-owner occupied
Aging of Past Due Loans by Class of Loans
Current			767,821,000
Total loan balance	693,103,000	11,672,000	767,821,000
CRE - non-owner occupied | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	485,000
Current	692,618,000
Total loan balance	693,103,000		767,821,000
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
Land and construction
Aging of Past Due Loans by Class of Loans
Current			147,189,000
Total loan balance	144,594,000	1,458,000	147,189,000
Land and construction | Real estate
Aging of Past Due Loans by Class of Loans
Current	144,594,000
Total loan balance	144,594,000		147,189,000
Home equity
Aging of Past Due Loans by Class of Loans
Total Past Due			137,000
Current			151,638,000
Total loan balance	111,885,000	1,321,000	151,775,000
Home equity | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due			137,000
Home equity | Real estate
Aging of Past Due Loans by Class of Loans
Current	111,885,000
Total loan balance	111,885,000		151,775,000
Multi-family
Aging of Past Due Loans by Class of Loans
Current			180,623,000
Total loan balance	166,425,000	1,253,000	180,623,000
Multi-family | Real estate
Aging of Past Due Loans by Class of Loans
Current	166,425,000
Total loan balance	166,425,000		180,623,000
Residential mortgages
Aging of Past Due Loans by Class of Loans
Current			100,759,000
Total loan balance	85,116,000	678,000	100,759,000
Residential mortgages | Real estate
Aging of Past Due Loans by Class of Loans
Current	85,116,000
Total loan balance	85,116,000		100,759,000
Consumer and other
Aging of Past Due Loans by Class of Loans
Current			33,744,000
Total loan balance	18,116,000	$ 1,689,000	33,744,000
Consumer and other | Consumer
Aging of Past Due Loans by Class of Loans
Total Past Due	407,000
Current	17,709,000
Total loan balance	18,116,000		$ 33,744,000
Consumer and other | Consumer | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 407,000

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