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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) Loans contract | Mar. 31, 2018 USD ($) Loans contract | Dec. 31, 2018 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding Recorded Investment | $ 3,135 |  | $ 3,220
Reserves specific to modified loans | 53 |  | 50
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 |  |
Number of Loans | Loans | 0 | 0 |
Defaults on troubled debt restructurings | contract | 0 | 0 |
Commercial Real Estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 1 |  |
Commercial | Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding Recorded Investment |  |  | 36
Number of Loans | Loans |  | 1 |
Pre-Modification Outstanding Recorded Investment |  | $ 38 |
Principal Modification |  | 0 |
Post Modification Outstanding Recorded Investment |  | $ 38 |
Real Estate | Commercial real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding Recorded Investment |  |  | $ 165
Number of Loans | Loans |  | 1 |
Pre-Modification Outstanding Recorded Investment |  | $ 166 |
Principal Modification |  | 0 |
Post Modification Outstanding Recorded Investment |  | 166 |
Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding Recorded Investment | $ 13 |  |
Number of Loans | Loans | 1 |  |
Pre-Modification Outstanding Recorded Investment | $ 13 |  |
Principal Modification | 0 |  |
Post Modification Outstanding Recorded Investment | 13 |  |
Consumer | Equity loans and lines of credit |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding Recorded Investment | $ 13 |  |
Number of Loans | Loans | 1 |  |
Pre-Modification Outstanding Recorded Investment | $ 13 |  |
Principal Modification | 0 |  |
Post Modification Outstanding Recorded Investment | $ 13 |  |
Commercial and Real Estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding Recorded Investment |  | $ 201 |
Number of Loans | Loans |  | 2 |
Pre-Modification Outstanding Recorded Investment |  | $ 204 |
Principal Modification |  | 0 |
Post Modification Outstanding Recorded Investment |  | $ 204 |

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