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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Loans | Dec. 31, 2017 USD ($) Loans | Dec. 31, 2016 USD ($) Loans
Financing Receivable, Modifications [Line Items] |  |  |
Reserves specific to modified loans | $ 50 | $ 36 |
Additional commitments to lend | 0 |  |
Outstanding Recorded Investment | $ 3,220 | $ 3,551 |
Defaults on troubled debt restructurings | Loans |  | 0 |
Real Estate and Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 2 | 3 |
Pre-Modification Outstanding Recorded Investment | $ 204 | $ 549 |
Principal Modification | 0 | 0 |
Post Modification Outstanding Recorded Investment | 204 | 1,125 |
Outstanding Recorded Investment | $ 191 | $ 1,110 |
Real Estate | Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 1 |  |
Pre-Modification Outstanding Recorded Investment | $ 166 |  |
Principal Modification | 0 |  |
Post Modification Outstanding Recorded Investment | 166 |  |
Outstanding Recorded Investment | $ 161 |  |
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 | 1 |  | 2
Pre-Modification Outstanding Recorded Investment | $ 38 |  | $ 45
Principal Modification | 0 |  | 0
Post Modification Outstanding Recorded Investment | 38 |  | 45
Outstanding Recorded Investment | $ 30 |  | $ 40

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