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Loans and Allowance - Summary of Troubled Debt Restructurings by Modification (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Total Modification | $ 777 | $ 2,717
Term Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 249 | 1,295
Rate Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 289 | 939
Combination |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 239 | 483
Commercial and industrial loans |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  | 369
Commercial and industrial loans | Term Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  | 203
Commercial and industrial loans | Combination |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  | 166
Agriculture production financing and other loans to farmers |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  | 387
Agriculture production financing and other loans to farmers | Term Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  | 387
Agriculture production financing and other loans to farmers | Rate Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  |
Commercial and farmland |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 85 | 996
Commercial and farmland | Term Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 85 | 705
Commercial and farmland | Rate Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  | 59
Commercial and farmland | Combination |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  | 232
Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 448 | 846
Residential | Term Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  |
Residential | Rate Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 209 | 761
Residential | Combination |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 239 | 85
Home equity |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 180 | 105
Home equity | Term Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 106 |
Home equity | Rate Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 74 | 105
Home equity | Combination |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  |
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 64 | 14
Individuals' loans for household and other personal expenditures | Term Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | 58 |
Individuals' loans for household and other personal expenditures | Rate Modification |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification | $ 6 | 14
Individuals' loans for household and other personal expenditures | Combination |  |
Financing Receivable, Modifications [Line Items] |  |
Total Modification |  |

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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