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Loans and Allowance for Credit Losses - Loans Restructured as TDRs, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan | 5 | 4
Balance Prior to TDR | $ 1,948 | $ 997
Financial Impact on Date of Restructure |  | $ 0
Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan | 54 | 56
Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan | 5 | 4
Balance Prior to TDR | $ 1,948 | $ 997
Balance | 1,896 | 996
Financial Impact on Date of Restructure | $ 0 | $ 0
Real Estate | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan | 48 | 49
Real Estate | Change in Maturity Date |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 1,896 | $ 996
Real Estate | Change in Rate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 0 | $ 0
Real Estate | Construction and development | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan |  | 1
Real Estate | Single family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan | 5 | 4
Balance Prior to TDR | $ 1,948 | $ 997
Balance | 1,896 | 996
Financial Impact on Date of Restructure | $ 0 | $ 0
Real Estate | Single family residential | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan | 46 | 45
Real Estate | Single family residential | Change in Maturity Date |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 1,896 | $ 996
Real Estate | Single family residential | Change in Rate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 0 | 0
Real Estate | Other commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance Prior to TDR |  | $ 690
Real Estate | Other commercial | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan | 2 | 3
Commercial | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan | 6 | 7
Commercial | Commercial | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | loan | 6 | 7

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