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Loans and Allowance for Credit Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 loan | Dec. 31, 2019 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans | 1 | 0 | 1 | 0 |
Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 28 |  | 30
Troubled debt, balance | $ | $ 4,778 |  | $ 4,778 |  | $ 5,313
Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 16 |  | 12
Troubled debt, balance | $ | 3,960 |  | $ 3,960 |  | $ 4,411
Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 12 |  | 18
Troubled debt, balance | $ | 818 |  | $ 818 |  | $ 902
Real Estate | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 21 |  | 23
Troubled debt, balance | $ | 1,971 |  | $ 1,971 |  | $ 2,450
Real Estate | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 12 |  | 8
Troubled debt, balance | $ | 1,221 |  | $ 1,221 |  | $ 1,627
Real Estate | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 9 |  | 15
Troubled debt, balance | $ | $ 750 |  | $ 750 |  | $ 823
Real Estate | Construction and development | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  |  |  | 1
Troubled debt, balance | $ |  |  |  |  | $ 72
Real Estate | Construction and development | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  |  |  | 0
Troubled debt, balance | $ |  |  |  |  | $ 0
Real Estate | Construction and development | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  |  |  | 1
Troubled debt, balance | $ |  |  |  |  | $ 72
Real Estate | Single family residential |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans | 1 |  | 1 |  |
Real Estate | Single family residential | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 19 |  | 19
Troubled debt, balance | $ | $ 1,901 |  | $ 1,901 |  | $ 1,822
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 12 |  | 7
Troubled debt, balance | $ | 1,221 |  | $ 1,221 |  | $ 1,151
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 7 |  | 12
Troubled debt, balance | $ | 680 |  | $ 680 |  | $ 671
Real Estate | Other commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 2 |  | 3
Troubled debt, balance | $ | 70 |  | $ 70 |  | $ 556
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 0 |  | 1
Troubled debt, balance | $ | 0 |  | $ 0 |  | $ 476
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 2 |  | 2
Troubled debt, balance | $ | 70 |  | $ 70 |  | $ 80
Commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 7 |  | 7
Troubled debt, balance | $ | 2,807 |  | $ 2,807 |  | $ 2,863
Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 4 |  | 4
Troubled debt, balance | $ | 2,739 |  | $ 2,739 |  | $ 2,784
Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 3 |  | 3
Troubled debt, balance | $ | 68 |  | $ 68 |  | $ 79
Commercial | Commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 7 |  | 7
Troubled debt, balance | $ | 2,807 |  | $ 2,807 |  | $ 2,863
Commercial | Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 4 |  | 4
Troubled debt, balance | $ | 2,739 |  | $ 2,739 |  | $ 2,784
Commercial | Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 3 |  | 3
Troubled debt, balance | $ | $ 68 |  | $ 68 |  | $ 79

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