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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Loans | Dec. 31, 2016 USD ($) Loans | Dec. 31, 2015 USD ($) Loans | Jun. 30, 2016 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |
Reserves specific to modified loans | $ 36 | $ 82 |  |
Additional commitments to lend | 0 |  |  |
Outstanding Recorded Investment | $ 3,551 | $ 3,109 |  |
Defaults on troubled debt restructurings | Loans |  | 0 |  |
Real Estate and Consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loans | 3 |  |  |
Pre-Modification Outstanding Recorded Investment | $ 549 |  |  |
Principal Modification | 0 |  |  |
Post Modification Outstanding Recorded Investment | 1,125 |  |  |
Outstanding Recorded Investment | $ 1,110 |  |  |
Real Estate | Agricultural real estate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loans | 1 |  |  |
Pre-Modification Outstanding Recorded Investment | $ 59 |  |  |
Principal Modification | 0 |  |  |
Post Modification Outstanding Recorded Investment | 59 |  |  |
Outstanding Recorded Investment | $ 51 |  |  |
Consumer | Equity loans and lines of credit |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loans | 2 |  |  |
Pre-Modification Outstanding Recorded Investment | $ 490 |  |  |
Principal Modification | 0 |  |  |
Post Modification Outstanding Recorded Investment | 1,066 |  |  |
Outstanding Recorded Investment | $ 1,059 |  |  |
Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loans |  | 2 | 2 |
Pre-Modification Outstanding Recorded Investment |  | $ 45 | $ 42 |
Principal Modification |  | 0 | 0 |
Post Modification Outstanding Recorded Investment |  | $ 45 | 42 |
Outstanding Recorded Investment |  |  | $ 30 | $ 40

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