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Loans and Allowance for Loan Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 loan | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 loan | Dec. 31, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts | 1 | 6 | 1 | 8 |
Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 28 |  | 33
Troubled debt, balance | $ | $ 8,277 |  | $ 8,277 |  | $ 9,215
Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 12 |  | 12
Troubled debt, balance | $ | 6,519 |  | $ 6,519 |  | $ 6,369
Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 16 |  | 21
Troubled debt, balance | $ | $ 1,758 |  | $ 1,758 |  | $ 2,846
Real Estate |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts | 1 | 3 | 1 | 4 |
Real Estate | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 21 |  | 23
Troubled debt, balance | $ | $ 5,389 |  | $ 5,389 |  | $ 5,664
Real Estate | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 8 |  | 8
Troubled debt, balance | $ | 3,715 |  | $ 3,715 |  | $ 3,536
Real Estate | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 13 |  | 15
Troubled debt, balance | $ | 1,674 |  | $ 1,674 |  | $ 2,128
Real Estate | Construction |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  | 1 |  | 1 |
Real Estate | Construction | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 1 |  | 3
Troubled debt, balance | $ | 97 |  | $ 97 |  | $ 485
Real Estate | Construction | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 0 |  | 0
Troubled debt, balance | $ | 0 |  | $ 0 |  | $ 0
Real Estate | Construction | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 1 |  | 3
Troubled debt, balance | $ | $ 97 |  | $ 97 |  | $ 485
Real Estate | Single family residential |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts | 1 |  | 1 | 1 |
Real Estate | Single family residential | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 16 |  | 16
Troubled debt, balance | $ | $ 1,176 |  | $ 1,176 |  | $ 846
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 6 |  | 6
Troubled debt, balance | $ | 549 |  | $ 549 |  | $ 230
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 10 |  | 10
Troubled debt, balance | $ | 627 |  | $ 627 |  | $ 616
Real Estate | Other commercial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  | 2 |  | 2 |
Real Estate | Other commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 4 |  | 4
Troubled debt, balance | $ | 4,116 |  | $ 4,116 |  | $ 4,333
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 2 |  | 2
Troubled debt, balance | $ | 3,166 |  | $ 3,166 |  | $ 3,306
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 2 |  | 2
Troubled debt, balance | $ | 950 |  | $ 950 |  | $ 1,027
Commercial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  | 3 |  | 3 |
Commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 7 |  | 10
Troubled debt, balance | $ | 2,888 |  | $ 2,888 |  | $ 3,551
Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 4 |  | 4
Troubled debt, balance | $ | 2,804 |  | $ 2,804 |  | $ 2,833
Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 3 |  | 6
Troubled debt, balance | $ | 84 |  | $ 84 |  | $ 718
Commercial | Commercial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  | 3 |  | 3 |
Commercial | Commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 7 |  | 10
Troubled debt, balance | $ | 2,888 |  | $ 2,888 |  | $ 3,551
Commercial | Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 4 |  | 4
Troubled debt, balance | $ | 2,804 |  | $ 2,804 |  | $ 2,833
Commercial | Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled debt, number of contracts |  |  | 3 |  | 6
Troubled debt, balance | $ | $ 84 |  | $ 84 |  | $ 718

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