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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) contract | Jun. 30, 2016 USD ($) contract | Jun. 30, 2017 USD ($) Loans contract | Jun. 30, 2016 USD ($) Loans contract | Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Outstanding Recorded Investment | $ 2,847 |  | $ 2,847 |  | $ 3,109
Reserves specific to modified loans | 30 |  | 30 |  | $ 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 | $ 123 | $ 44 | $ 123 | $ 44 |
Number of Loans | Loans |  |  | 2 | 2 |
Pre-Modification Outstanding Recorded Investment |  |  | $ 121 | $ 45 |
Principal Modification |  |  | 0 | 0 |
Post Modification Outstanding Recorded Investment |  |  | 125 | $ 45 |
Agricultural real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Outstanding Recorded Investment | 59 |  | $ 59 |  |
Number of Loans | Loans |  |  | 1 |  |
Pre-Modification Outstanding Recorded Investment |  |  | $ 59 |  |
Principal Modification |  |  | 0 |  |
Post Modification Outstanding Recorded Investment |  |  | 59 |  |
Equity loans and lines of credit |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Outstanding Recorded Investment | $ 64 |  | $ 64 |  |
Number of Loans | Loans |  |  | 1 |  |
Pre-Modification Outstanding Recorded Investment |  |  | $ 62 |  |
Principal Modification |  |  | 0 |  |
Post Modification Outstanding Recorded Investment |  |  | $ 66 |  |

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