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Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
contract
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
contract
Sep. 30, 2020
USD ($)
contract
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | contract 4   9 4
Total Modifications $ 672 $ 0 $ 907 $ 175
1-4 Family Residential Real Estate Loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | contract 3   5  
Total Modifications $ 219   $ 344  
Commercial Real Estate Loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | contract 1   1 1
Total Modifications $ 453   $ 453 $ 58
Commercial loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | contract     3 3
Total Modifications     $ 110 $ 117
Extended Amortization Period        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications 0   0 0
Extended Amortization Period | 1-4 Family Residential Real Estate Loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications 0   0  
Extended Amortization Period | Commercial Real Estate Loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications 0   0 0
Extended Amortization Period | Commercial loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications     0 0
Interest Rate Reduction        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications 0   16 0
Interest Rate Reduction | 1-4 Family Residential Real Estate Loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications 0   0  
Interest Rate Reduction | Commercial Real Estate Loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications 0   0 0
Interest Rate Reduction | Commercial loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications     16 0
Combination        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications 672   891 175
Combination | 1-4 Family Residential Real Estate Loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications 219   344  
Combination | Commercial Real Estate Loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications $ 453   453 58
Combination | Commercial loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Modifications     $ 94 $ 117