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Loans and Allowance for Loan Losses Schedule of Impaired Loans With and Without an Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment $ 377 $ 538  
Impaired loans, with no related allowance, unpaid principal balance 377 538  
Impaired loans, with related allowance, recorded investment 15,817 0  
Impaired loans, with related allowance, unpaid principal balance 15,817 0  
Impaired loans, recorded investment 16,194 538  
Impaired loans, unpaid principal balance 16,194 538  
Impaired loans, related allowance 3,000 0  
Impaired loans, with no related allowance, average recorded investment 4,095 1,178 $ 1,573
Impaired loans, with no related allowance, interest income, accrual method 24 69 6
Impaired loans, with related allowance, average recorded investment 1,556 65 125
Impaired loans, with related allowance, interest income, accrual method 0 6 0
Impaired loans, average recorded investment 5,651 1,243 1,698
Impaired loans, interest income, accrual method 24 75 6
Impaired loans, interest lost on nonaccrual loans 235 25 96
Commercial [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 0 91  
Impaired loans, with no related allowance, unpaid principal balance 0 91  
Impaired loans, with related allowance, recorded investment 0 0  
Impaired loans, with related allowance, unpaid principal balance 0 0  
Impaired loans, recorded investment 0 91  
Impaired loans, unpaid principal balance 0 91  
Impaired loans, related allowance 0 0  
Impaired loans, with no related allowance, average recorded investment 42 687 738
Impaired loans, with no related allowance, interest income, accrual method 2 39 0
Impaired loans, with related allowance, average recorded investment 339 7 1
Impaired loans, with related allowance, interest income, accrual method 0 0 0
Impaired loans, average recorded investment 381 694 739
Impaired loans, interest income, accrual method 2 39 0
Construction, land and land development [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 0 0  
Impaired loans, with no related allowance, unpaid principal balance 0 0  
Impaired loans, with related allowance, recorded investment 0 0  
Impaired loans, with related allowance, unpaid principal balance 0 0  
Impaired loans, recorded investment 0 0  
Impaired loans, unpaid principal balance 0 0  
Impaired loans, related allowance 0 0  
Impaired loans, with no related allowance, average recorded investment 0 0 0
Impaired loans, with no related allowance, interest income, accrual method 0 0 0
Impaired loans, with related allowance, average recorded investment 0 0 0
Impaired loans, with related allowance, interest income, accrual method 0 0 0
Impaired loans, average recorded investment 0 0 0
Impaired loans, interest income, accrual method 0 0 0
1-4 family residential first mortgages [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 377 411  
Impaired loans, with no related allowance, unpaid principal balance 377 411  
Impaired loans, with related allowance, recorded investment 0 0  
Impaired loans, with related allowance, unpaid principal balance 0 0  
Impaired loans, recorded investment 377 411  
Impaired loans, unpaid principal balance 377 411  
Impaired loans, related allowance 0 0  
Impaired loans, with no related allowance, average recorded investment 392 73 113
Impaired loans, with no related allowance, interest income, accrual method 5 6 0
Impaired loans, with related allowance, average recorded investment 0 0 0
Impaired loans, with related allowance, interest income, accrual method 0 0 0
Impaired loans, average recorded investment 392 73 113
Impaired loans, interest income, accrual method 5 6 0
Home equity [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 0 31  
Impaired loans, with no related allowance, unpaid principal balance 0 31  
Impaired loans, with related allowance, recorded investment 0 0  
Impaired loans, with related allowance, unpaid principal balance 0 0  
Impaired loans, recorded investment 0 31  
Impaired loans, unpaid principal balance 0 31  
Impaired loans, related allowance 0 0  
Impaired loans, with no related allowance, average recorded investment 2 34 122
Impaired loans, with no related allowance, interest income, accrual method 0 2 6
Impaired loans, with related allowance, average recorded investment 0 0 15
Impaired loans, with related allowance, interest income, accrual method 0 0 0
Impaired loans, average recorded investment 2 34 137
Impaired loans, interest income, accrual method 0 2 6
Commercial real estate [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 0 5  
Impaired loans, with no related allowance, unpaid principal balance 0 5  
Impaired loans, with related allowance, recorded investment 15,817 0  
Impaired loans, with related allowance, unpaid principal balance 15,817 0  
Impaired loans, recorded investment 15,817 5  
Impaired loans, unpaid principal balance 15,817 5  
Impaired loans, related allowance 3,000 0  
Impaired loans, with no related allowance, average recorded investment 3,659 384 600
Impaired loans, with no related allowance, interest income, accrual method 17 22 0
Impaired loans, with related allowance, average recorded investment 1,217 58 109
Impaired loans, with related allowance, interest income, accrual method 0 6 0
Impaired loans, average recorded investment 4,876 442 709
Impaired loans, interest income, accrual method 17 28 0
Consumer and other [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 0 0  
Impaired loans, with no related allowance, unpaid principal balance 0 0  
Impaired loans, with related allowance, recorded investment 0 0  
Impaired loans, with related allowance, unpaid principal balance 0 0  
Impaired loans, recorded investment 0 0  
Impaired loans, unpaid principal balance 0 0  
Impaired loans, related allowance 0 0  
Impaired loans, with no related allowance, average recorded investment 0 0 0
Impaired loans, with no related allowance, interest income, accrual method 0 0 0
Impaired loans, with related allowance, average recorded investment 0 0 0
Impaired loans, with related allowance, interest income, accrual method 0 0 0
Impaired loans, average recorded investment 0 0 0
Impaired loans, interest income, accrual method $ 0 $ 0 $ 0