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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Loans | Sep. 30, 2017 USD ($) Loans | Sep. 30, 2018 USD ($) Loans contract | Sep. 30, 2017 USD ($) Loans contract | Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Outstanding Recorded Investment | $ 3,393 |  | $ 3,393 |  | $ 3,551
Reserves specific to modified loans | 189 |  | 189 |  | $ 36
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 |  | $ 0 |  |
Number of Loans | Loans | 0 | 0 |  |  |
Defaults on troubled debt restructurings | contract |  |  | 0 | 0 |
Commercial | Commercial and industrial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Outstanding Recorded Investment | $ 31 |  | $ 31 |  |
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 | 163 |  | $ 163 |  |
Number of Loans | Loans |  |  | 1 |  |
Pre-Modification Outstanding Recorded Investment |  |  | $ 166 |  |
Principal Modification |  |  | 0 |  |
Post Modification Outstanding Recorded Investment |  |  | 166 |  |
Real Estate | Agricultural real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Outstanding Recorded Investment |  | $ 51 |  | $ 51 |
Number of Loans | Loans |  |  |  | 1 |
Pre-Modification Outstanding Recorded Investment |  |  |  | $ 59 |
Principal Modification |  |  |  | 0 |
Post Modification Outstanding Recorded Investment |  |  |  | 59 |
Consumer | Equity loans and lines of credit |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Outstanding Recorded Investment |  | 62 |  | $ 62 |
Number of Loans | Loans |  |  |  | 1 |
Pre-Modification Outstanding Recorded Investment |  |  |  | $ 62 |
Principal Modification |  |  |  | 0 |
Post Modification Outstanding Recorded Investment |  |  |  | 66 |
Real Estate and Consumer |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Outstanding Recorded Investment |  | $ 113 |  | $ 113 |
Number of Loans | Loans |  |  |  | 2 |
Pre-Modification Outstanding Recorded Investment |  |  |  | $ 121 |
Principal Modification |  |  |  | 0 |
Post Modification Outstanding Recorded Investment |  |  |  | $ 125 |
Commercial and Real Estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Outstanding Recorded Investment | $ 194 |  | $ 194 |  |
Number of Loans | Loans |  |  | 2 |  |
Pre-Modification Outstanding Recorded Investment |  |  | $ 204 |  |
Principal Modification |  |  | 0 |  |
Post Modification Outstanding Recorded Investment |  |  | $ 204 |  |

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