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Loans and Allowance for Loan Losses - Loans Restructured as TDRs, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan | 1 | 6 | 1 | 8
Balance Prior to TDR | $ 330 | $ 2,854 | $ 330 | $ 3,006
Balance | 330 | 2,846 | 330 | 2,999
Financial Impact on Date of Restructure | 0 | 402 | 0 | 402
Change in Maturity Date |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance | 330 | 2,846 | 330 | 2,999
Change in Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance | $ 0 | $ 0 | $ 0 | $ 0
Consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan |  |  |  | 1
Balance Prior to TDR |  |  |  | $ 91
Balance |  |  |  | 91
Financial Impact on Date of Restructure |  |  |  | 0
Consumer | Change in Maturity Date |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  |  |  | 91
Consumer | Change in Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  |  |  | $ 0
Consumer | Other consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan |  |  |  | 1
Balance Prior to TDR |  |  |  | $ 91
Balance |  |  |  | 91
Financial Impact on Date of Restructure |  |  |  | 0
Consumer | Other consumer | Change in Maturity Date |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  |  |  | 91
Consumer | Other consumer | Change in Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  |  |  | $ 0
Real Estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan | 1 | 3 | 1 | 4
Balance Prior to TDR | $ 330 | $ 491 | $ 330 | $ 552
Balance | 330 | 488 | 330 | 550
Financial Impact on Date of Restructure | 0 | 212 | 0 | 212
Real Estate | Change in Maturity Date |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance | 330 | 488 | 330 | 550
Real Estate | Change in Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance | $ 0 | $ 0 | $ 0 | $ 0
Real Estate | Construction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan |  | 1 |  | 1
Balance Prior to TDR |  | $ 99 |  | $ 99
Balance |  | 98 |  | 98
Financial Impact on Date of Restructure |  | 0 |  | 0
Real Estate | Construction | Change in Maturity Date |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  | 98 |  | 98
Real Estate | Construction | Change in Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  | $ 0 |  | $ 0
Real Estate | Single family residential |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan | 1 |  | 1 | 1
Balance Prior to TDR | $ 330 |  | $ 330 | $ 61
Balance | 330 |  | 330 | 62
Financial Impact on Date of Restructure | 0 |  | 0 | 0
Real Estate | Single family residential | Change in Maturity Date |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance | 330 |  | 330 | 62
Real Estate | Single family residential | Change in Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance | $ 0 |  | $ 0 | $ 0
Real Estate | Other commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan |  | 2 |  | 2
Balance Prior to TDR |  | $ 392 |  | $ 392
Balance |  | 390 |  | 390
Financial Impact on Date of Restructure |  | 212 |  | 212
Real Estate | Other commercial | Change in Maturity Date |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  | 390 |  | 390
Real Estate | Other commercial | Change in Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  | $ 0 |  | $ 0
Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan |  | 3 |  | 3
Balance Prior to TDR |  | $ 2,363 |  | $ 2,363
Balance |  | 2,358 |  | 2,358
Financial Impact on Date of Restructure |  | 190 |  | 190
Commercial | Change in Maturity Date |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  | 2,358 |  | 2,358
Commercial | Change in Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  | $ 0 |  | $ 0
Commercial | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan |  | 3 |  | 3
Balance Prior to TDR |  | $ 2,363 |  | $ 2,363
Balance |  | 2,358 |  | 2,358
Financial Impact on Date of Restructure |  | 190 |  | 190
Commercial | Commercial | Change in Maturity Date |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  | 2,358 |  | 2,358
Commercial | Commercial | Change in Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Balance |  | $ 0 |  | $ 0

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