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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) Loans contract | Mar. 31, 2016 USD ($) Loans contract | Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 |  |
Outstanding Recorded Investment | 3,058 |  | $ 3,109
Reserves specific to modified loans | $ 73 |  | $ 82
Defaults on troubled debt restructurings | contract | 0 | 0 |
Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 2 | 2 |
Pre-Modification Outstanding Recorded Investment | $ 121 | $ 45 |
Principal Modification | 0 | 0 |
Post Modification Outstanding Recorded Investment | 125 | 45 |
Outstanding Recorded Investment | $ 125 | $ 45 |
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 | $ 59 |  |
Equity loans and lines of credit |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 1 |  |
Pre-Modification Outstanding Recorded Investment | $ 62 |  |
Principal Modification | 0 |  |
Post Modification Outstanding Recorded Investment | 66 |  |
Outstanding Recorded Investment | $ 66 |  |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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