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Allowance for Credit Losses on Loans - Activity in Allowance for Losses Disaggregated on Basis of Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff $ 947 $ 842 $ 1,267 $ 4,694          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 554 361 1,207 1,816          
Allowance for Loan and Lease Losses, Write-offs     (1,267) (4,694)          
Allowance for Loan and Lease Loss, Recovery of Bad Debts     1,207 1,816          
Provision for credit losses (2,852) 2,320 (21,808) 38,225          
Allowance for credit losses on loans 48,317 73,340 48,317 73,340 $ 51,562 $ 70,185 $ 71,501 $ 37,993 $ 36,171
Cumulative Effect, Period of Adoption, Adjustment                  
Schedule of allowance for loan losses on the basis of impairment method                  
Allowance for credit losses on loans           0     1,822
Cumulative Effect, Period of Adoption, Adjusted Balance                  
Schedule of allowance for loan losses on the basis of impairment method                  
Allowance for credit losses on loans           70,185     37,993
Commercial Portfolio Segment                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 743 507 757 3,553          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 385 80 735 1,220          
Provision for credit losses (1,246) 4,718 (14,513) 36,068          
Allowance for credit losses on loans 35,073 54,733 35,073 54,733 36,677 49,608 50,442 20,998  
Commercial Portfolio Segment | Commercial and Industrial                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 743 507 757 3,418          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 373 78 710 1,204          
Provision for credit losses 1,531 1,815 (11,317) 22,982          
Allowance for credit losses on loans 18,646 31,159 18,646 31,159 17,485 30,010 29,773 10,391  
Commercial Portfolio Segment | Owner Occupied Commercial Real Estate                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0 0 135          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 12 2 25 16          
Provision for credit losses (1,644) 3,027 (2,581) 8,187          
Allowance for credit losses on loans 6,930 13,032 6,930 13,032 8,562 9,486 10,003 4,964  
Commercial Portfolio Segment | Non Owner Occupied Commercial Real Estate                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0 0 0          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 0 0 0 0          
Provision for credit losses (1,133) (124) (615) 4,899          
Allowance for credit losses on loans 9,497 10,542 9,497 10,542 10,630 10,112 10,666 5,643  
Commercial Portfolio Segment | Paycheck Protection Program                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 0   0 0          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 0   0 0          
Provision for credit losses 0   0 0          
Allowance for credit losses on loans 0 0 0 0 0 0   0 $ 0
Residential Portfolio Segment                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0 0 0          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 0 0 0 3          
Provision for credit losses (67) (398) (505) (1,107)          
Allowance for credit losses on loans 1,086 1,825 1,086 1,825 1,153 1,591 2,223 2,929  
Real Estate Construction and Land Development                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0 1 0          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 8 139 28 160          
Provision for credit losses (1,394) 28 (4,034) (598)          
Allowance for credit losses on loans 9,085 9,291 9,085 9,291 10,471 13,092 9,124 9,729  
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0 0 0          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 8 139 28 160          
Provision for credit losses 136 (42) (199) (380)          
Allowance for credit losses on loans 1,780 664 1,780 664 1,636 1,951 567 884  
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0 1 0          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 0 0 0 0          
Provision for credit losses (1,530) 70 (3,835) (218)          
Allowance for credit losses on loans 7,305 8,627 7,305 8,627 8,835 11,141 8,557 8,845  
Consumer Portfolio Segment                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff 204 335 509 1,141          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery 161 142 444 433          
Provision for credit losses (145) (2,028) (2,756) 3,862          
Allowance for credit losses on loans $ 3,073 7,491 $ 3,073 7,491 $ 3,261 $ 5,894 $ 9,712 4,337  
Unallocated                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Writeoff       0          
Schedule of allowance for loan losses on the basis of impairment method                  
Financing Receivable, Allowance for Credit Loss, Recovery       0          
Provision for credit losses       0          
Allowance for credit losses on loans   $ 0   $ 0       $ 0