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Allowance for Credit Losses on Loans - Summary of Changes in Loan Allowance (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 01, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for Loan and Lease Losses, Period Increase (Decrease)       $ (21,900)    
Allowance for Loan and Lease Losses, Period Increase (Decrease), Percent       (31.20%)    
Financing Receivable, Allowance for Credit Loss, Writeoff   $ (947) $ (842) $ (1,267) $ (4,694)  
Schedule of changes in allowance for loan losses            
Beginning Balance $ 36,171 51,562 71,501 70,185 36,171  
Recoveries   (554) (361) (1,207) (1,816)  
(Reversal of) Provision for Credit Losses   (2,852) 2,320 (21,808) 38,225  
Ending Balance 37,993 48,317 73,340 48,317 73,340  
Total Allowance for Credit Losses           $ 36,171
Allowance for credit losses on loans 37,993 48,317 73,340 48,317 73,340 36,171
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  
Cumulative Effect, Period of Adoption, Adjustment            
Schedule of changes in allowance for loan losses            
Beginning Balance 1,822     0 1,822  
Allowance for credit losses on loans           1,822
Cumulative Effect, Period of Adoption, Adjusted Balance            
Schedule of changes in allowance for loan losses            
Beginning Balance 37,993     70,185 37,993  
Allowance for credit losses on loans           37,993
Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption 5,600          
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 1,822          
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 changes in allowance for loan losses            
Beginning Balance   36,677 50,442 49,608    
Recoveries   (385) (80) (735) (1,220)  
(Reversal of) Provision for Credit Losses   (1,246) 4,718 (14,513) 36,068  
Ending Balance 20,998 35,073 54,733 35,073 54,733  
Total Allowance for Credit Losses           23,933
Allowance for credit losses on loans 20,998 35,073 54,733 35,073 54,733  
Commercial Portfolio Segment | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption (2,935)          
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 changes in allowance for loan losses            
Beginning Balance   17,485 29,773 30,010    
Recoveries   (373) (78) (710) (1,204)  
(Reversal of) Provision for Credit Losses   1,531 1,815 (11,317) 22,982  
Ending Balance 10,391 18,646 31,159 18,646 31,159  
Total Allowance for Credit Losses           11,739
Allowance for credit losses on loans 10,391 18,646 31,159 18,646 31,159  
Commercial Portfolio Segment | Commercial and Industrial | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption (1,348)          
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 changes in allowance for loan losses            
Beginning Balance   8,562 10,003 9,486    
Recoveries   (12) (2) (25) (16)  
(Reversal of) Provision for Credit Losses   (1,644) 3,027 (2,581) 8,187  
Ending Balance 4,964 6,930 13,032 6,930 13,032  
Total Allowance for Credit Losses           4,512
Allowance for credit losses on loans 4,964 6,930 13,032 6,930 13,032  
Commercial Portfolio Segment | Owner Occupied Commercial Real Estate | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption 452          
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 changes in allowance for loan losses            
Beginning Balance   10,630 10,666 10,112    
Recoveries   0 0 0 0  
(Reversal of) Provision for Credit Losses   (1,133) (124) (615) 4,899  
Ending Balance 5,643 9,497 10,542 9,497 10,542  
Total Allowance for Credit Losses           7,682
Allowance for credit losses on loans 5,643 9,497 10,542 9,497 10,542  
Commercial Portfolio Segment | Non Owner Occupied Commercial Real Estate | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption (2,039)          
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 changes in allowance for loan losses            
Beginning Balance 0 0   0 0  
Recoveries   0   0 0  
(Reversal of) Provision for Credit Losses   0   0 0  
Ending Balance 0 0 0 0 0  
Total Allowance for Credit Losses           0
Allowance for credit losses on loans 0 0 0 0 0 0
Commercial Portfolio Segment | Paycheck Protection Program | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption 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 changes in allowance for loan losses            
Beginning Balance   1,153 2,223 1,591    
Recoveries   0 0 0 (3)  
(Reversal of) Provision for Credit Losses   (67) (398) (505) (1,107)  
Ending Balance 2,929 1,086 1,825 1,086 1,825  
Total Allowance for Credit Losses           1,458
Allowance for credit losses on loans 2,929 1,086 1,825 1,086 1,825  
Residential Portfolio Segment | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption 1,471          
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 changes in allowance for loan losses            
Beginning Balance   10,471 9,124 13,092    
Recoveries   (8) (139) (28) (160)  
(Reversal of) Provision for Credit Losses   (1,394) 28 (4,034) (598)  
Ending Balance 9,729 9,085 9,291 9,085 9,291  
Total Allowance for Credit Losses           3,060
Allowance for credit losses on loans 9,729 9,085 9,291 9,085 9,291  
Real Estate Construction and Land Development | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption 6,669          
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 changes in allowance for loan losses            
Beginning Balance   1,636 567 1,951    
Recoveries   (8) (139) (28) (160)  
(Reversal of) Provision for Credit Losses   136 (42) (199) (380)  
Ending Balance 884 1,780 664 1,780 664  
Total Allowance for Credit Losses           1,455
Allowance for credit losses on loans 884 1,780 664 1,780 664  
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption (571)          
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 changes in allowance for loan losses            
Beginning Balance   8,835 8,557 11,141    
Recoveries   0 0 0 0  
(Reversal of) Provision for Credit Losses   (1,530) 70 (3,835) (218)  
Ending Balance 8,845 7,305 8,627 7,305 8,627  
Total Allowance for Credit Losses           1,605
Allowance for credit losses on loans 8,845 7,305 8,627 7,305 8,627  
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption 7,240          
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 changes in allowance for loan losses            
Beginning Balance   3,261 9,712 5,894    
Recoveries   (161) (142) (444) (433)  
(Reversal of) Provision for Credit Losses   (145) (2,028) (2,756) 3,862  
Ending Balance 4,337 3,073 7,491 3,073 7,491  
Total Allowance for Credit Losses           6,821
Allowance for credit losses on loans 4,337 $ 3,073 7,491 $ 3,073 7,491  
Consumer Portfolio Segment | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption (2,484)          
Unallocated            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Allowance for Credit Loss, Writeoff         0  
Schedule of changes in allowance for loan losses            
Recoveries         0  
(Reversal of) Provision for Credit Losses         0  
Ending Balance 0   0   0  
Total Allowance for Credit Losses           $ 899
Allowance for credit losses on loans 0   $ 0   $ 0  
Unallocated | Accounting Standards Update 2016-13            
Schedule of changes in allowance for loan losses            
Cumulative Effect of New Accounting Principle in Period of Adoption $ (899)