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Allowance for Loan Losses - Summary of Changes in Loan Allowance (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2021
Jan. 01, 2020
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2025
Jun. 30, 2020
Jan. 01, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Loss, Writeoff       $ (842)   $ (4,694)        
Schedule of changes in allowance for loan losses                    
Beginning Balance   $ 36,171     $ 36,363 36,171 $ 35,042      
Recoveries       (361)   (1,816)        
Recoveries         511   1,604      
Provision for Credit Losses       2,320 466 38,225 2,753      
Ending Balance         36,518   36,518      
Allowance for credit losses on loans   37,993   73,340   73,340     $ 71,501  
Allowance for Loan and Lease Losses, Write-offs         (822)   (2,881)      
Cumulative Effect of New Accounting Principle in Period of Adoption   (5,615)               $ (399)
Allowance for Loan and Lease Losses Write-offs, Net           2,900        
Accounting Standards Update 2016-13 [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method   1,822                
Schedule of changes in allowance for loan losses                    
Allowance for credit losses on loans   1,800                
Cumulative Effect of New Accounting Principle in Period of Adoption   5,600                
Commercial Portfolio Segment [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Loss, Writeoff       (507)   (3,553)        
Schedule of changes in allowance for loan losses                    
Beginning Balance   23,933     25,123 23,933 23,711      
Recoveries       (80)   (1,220)        
Recoveries         381   602      
Provision for Credit Losses       4,718 (732) 36,068 1,336      
Ending Balance         24,466   24,466      
Allowance for credit losses on loans   20,998   54,733   54,733     50,442  
Allowance for Loan and Lease Losses, Write-offs         (306)   (1,183)      
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]                    
Schedule of changes in allowance for loan losses                    
Cumulative Effect of New Accounting Principle in Period of Adoption   (2,935)                
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Loss, Writeoff       (507)   (3,418)        
Schedule of changes in allowance for loan losses                    
Beginning Balance   11,739     11,993 11,739 11,343      
Recoveries       (78)   (1,204)        
Recoveries         43   112      
Provision for Credit Losses       1,815 449 22,982 1,907      
Ending Balance         12,179   12,179      
Allowance for credit losses on loans   10,391   31,159   31,159     29,773  
Allowance for Loan and Lease Losses, Write-offs         (306)   (1,183)      
Financing Receivable, Allowance for Credit Loss, Writeoff Net           447        
Financing Receivable Allowance For Credit Losses WriteOff Details           1,700        
Financing Receivable, Allowance for Credit Losses, Recovery Details           963        
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Accounting Standards Update 2016-13 [Member]                    
Schedule of changes in allowance for loan losses                    
Cumulative Effect of New Accounting Principle in Period of Adoption   (1,348)                
Commercial Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Loss, Writeoff       0   (135)        
Schedule of changes in allowance for loan losses                    
Beginning Balance   4,512     5,066 4,512 4,898      
Recoveries       (2)   (16)        
Recoveries         46   49      
Provision for Credit Losses       3,027 (656) 8,187 (491)      
Ending Balance         4,456   4,456      
Allowance for credit losses on loans   4,964   13,032   13,032     10,003  
Allowance for Loan and Lease Losses, Write-offs         0   0      
Commercial Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member]                    
Schedule of changes in allowance for loan losses                    
Cumulative Effect of New Accounting Principle in Period of Adoption   452                
Commercial Portfolio Segment [Member] | Non Owner Occupied Commercial Real Estate [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Loss, Writeoff       0   0        
Schedule of changes in allowance for loan losses                    
Beginning Balance   7,682     8,064 7,682 7,470      
Recoveries       0   0        
Recoveries         292   441      
Provision for Credit Losses       (124) (525) 4,899 (80)      
Ending Balance         7,831   7,831      
Allowance for credit losses on loans   5,643   10,542   10,542     10,666  
Allowance for Loan and Lease Losses, Write-offs         0   0      
Commercial Portfolio Segment [Member] | Non Owner Occupied Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member]                    
Schedule of changes in allowance for loan losses                    
Cumulative Effect of New Accounting Principle in Period of Adoption   (2,039)                
Commercial Portfolio Segment [Member] | Paycheck Protection Program                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Loss, Writeoff       0   0        
Schedule of changes in allowance for loan losses                    
Beginning Balance   0       0        
Recoveries       0   0        
Provision for Credit Losses       0   0        
Allowance for credit losses on loans   0   0   0     0  
Commercial Portfolio Segment [Member] | Paycheck Protection Program | Accounting Standards Update 2016-13 [Member]                    
Schedule of changes in allowance for loan losses                    
Cumulative Effect of New Accounting Principle in Period of Adoption   0                
Residential Portfolio Segment [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Loss, Writeoff       0   0        
Schedule of changes in allowance for loan losses                    
Beginning Balance   1,458     1,345 1,458 1,203      
Recoveries       0   (3)        
Recoveries         0   0      
Provision for Credit Losses       (398) 81 (1,107) 253      
Ending Balance         1,411   1,411      
Allowance for credit losses on loans   2,929   1,825   1,825     2,223  
Allowance for Loan and Lease Losses, Write-offs         (15)   (45)      
Residential Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]                    
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        
Schedule of changes in allowance for loan losses                    
Beginning Balance   3,060     2,531 3,060 2,194      
Recoveries       (139)   (160)        
Recoveries         3   628      
Provision for Credit Losses       28 96 (598) (192)      
Ending Balance         2,630   2,630      
Allowance for credit losses on loans   9,729   9,291   9,291     9,124  
Allowance for Loan and Lease Losses, Write-offs         0   0      
Real Estate Construction and Land Development | Accounting Standards Update 2016-13 [Member]                    
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        
Schedule of changes in allowance for loan losses                    
Beginning Balance   1,455     1,471 1,455 1,240      
Recoveries       (139)   (160)        
Recoveries         3   628      
Provision for Credit Losses       (42) (133) (380) (527)      
Ending Balance         1,341   1,341      
Allowance for credit losses on loans   884   664   664     567  
Allowance for Loan and Lease Losses, Write-offs         0   0      
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction | Accounting Standards Update 2016-13 [Member]                    
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 [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Loss, Writeoff       0   0        
Schedule of changes in allowance for loan losses                    
Beginning Balance   1,605     1,060 1,605 954      
Recoveries       0   0        
Recoveries         0   0      
Provision for Credit Losses       70 229 (218) 335      
Ending Balance         1,289   1,289      
Allowance for credit losses on loans   8,845   8,627   8,627     8,557  
Allowance for Loan and Lease Losses, Write-offs         0   0      
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties [Member] | Accounting Standards Update 2016-13 [Member]                    
Schedule of changes in allowance for loan losses                    
Cumulative Effect of New Accounting Principle in Period of Adoption   7,240                
Consumer Portfolio Segment [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Financing Receivable, Allowance for Credit Loss, Writeoff       (335)   (1,141)        
Schedule of changes in allowance for loan losses                    
Beginning Balance   6,821     6,540 6,821 6,581      
Recoveries       (142)   (433)        
Recoveries         127   374      
Provision for Credit Losses       (2,028) 621 3,862 1,485      
Ending Balance         6,787   6,787      
Allowance for credit losses on loans   4,337   7,491   7,491     $ 9,712  
Allowance for Loan and Lease Losses, Write-offs         (501)   (1,653)      
Allowance for Loan and Lease Losses Write-offs, Net           708        
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]                    
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                    
Beginning Balance   899     824 899 1,353      
Recoveries           0        
Recoveries         0   0      
Provision for Credit Losses         400 0 (129)      
Ending Balance         1,224   1,224      
Allowance for credit losses on loans   0   $ 0   $ 0        
Allowance for Loan and Lease Losses, Write-offs         $ 0   $ 0      
Unallocated | Accounting Standards Update 2016-13 [Member]                    
Schedule of changes in allowance for loan losses                    
Cumulative Effect of New Accounting Principle in Period of Adoption   $ (899)                
Unemployment Rate [Member]                    
Schedule of changes in allowance for loan losses                    
Current Expected Credit Losses Model Valuation Input   3.50%                
Unemployment Rate [Member] | Forecast [Member]                    
Schedule of changes in allowance for loan losses                    
Current Expected Credit Losses Model Valuation Input     8.70%         4.00%    
COVID-19 [Member]                    
Schedule of changes in allowance for loan losses                    
Current Expected Credit Losses Model Valuation Input   1.80%                
COVID-19 [Member] | Forecast [Member]                    
Schedule of changes in allowance for loan losses                    
Current Expected Credit Losses Model Valuation Input 3.70%   3.70%