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Loans and Allowance for Loan Losses Schedule of Impaired Loans With and Without an Allowance (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Borrowers
Dec. 31, 2019
USD ($)
Borrowers
Loans, Impaired [Line Items]    
Impaired loans, with no related allowance, recorded investment $ 488 $ 538
Impaired loans, with no related allowance, unpaid principal balance 488 538
Impaired loans, with related allowance, recorded investment 0 0
Impaired loans, with related allowance, unpaid principal balance 0 0
Impaired loans, recorded investment 488 538
Impaired loans, unpaid principal balance 488 538
Impaired loans, related allowance $ 0 $ 0
Number of borrowers, impaired loans | Borrowers 3 6
Impaired loans, commitment to lend $ 0  
Commercial [Member]    
Loans, Impaired [Line Items]    
Impaired loans, with no related allowance, recorded investment 90 $ 91
Impaired loans, with no related allowance, unpaid principal balance 90 91
Impaired loans, with related allowance, recorded investment 0 0
Impaired loans, with related allowance, unpaid principal balance 0 0
Impaired loans, recorded investment 90 91
Impaired loans, unpaid principal balance 90 91
Impaired loans, related allowance 0 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
1-4 family residential first mortgages [Member]    
Loans, Impaired [Line Items]    
Impaired loans, with no related allowance, recorded investment 398 411
Impaired loans, with no related allowance, unpaid principal balance 398 411
Impaired loans, with related allowance, recorded investment 0 0
Impaired loans, with related allowance, unpaid principal balance 0 0
Impaired loans, recorded investment 398 411
Impaired loans, unpaid principal balance 398 411
Impaired loans, related allowance 0 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
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 0 0
Impaired loans, with related allowance, unpaid principal balance 0 0
Impaired loans, recorded investment 0 5
Impaired loans, unpaid principal balance 0 5
Impaired loans, related allowance 0 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