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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) contract | Sep. 30, 2016 contract | Sep. 30, 2017 USD ($) Loans contract | Sep. 30, 2016 USD ($) Loans contract | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Outstanding Recorded Investment | $ 2,722 |  | $ 2,722 |  | $ 3,109 |
Reserves specific to modified loans | 26 |  | 26 |  | $ 82 |
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 |  | $ 0 |  |  |
Defaults on troubled debt restructurings | contract | 0 | 0 | 0 | 0 |  |
Commercial and industrial |  |  |  |  |  |
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 |  |  |
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 |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Outstanding Recorded Investment |  |  |  |  |  | $ 42
Number of Loans | Loans |  |  | 2 | 2 |  |
Pre-Modification Outstanding Recorded Investment |  |  |  | $ 45 |  |
Principal Modification |  |  |  | 0 |  |
Post Modification Outstanding Recorded Investment |  |  |  | $ 45 |  |

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