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Loans and Allowance - Summary of Troubled Debt Restructurings (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance | $ 721 | $ 3,004
Post-Modification Recorded Balance | $ 719 | $ 2,902
Number of Loans | loan | 18 | 34
Commercial and industrial loans |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance |  | $ 599
Post-Modification Recorded Balance |  | $ 376
Number of Loans | loan |  | 3
Agriculture production financing and other loans to farmers |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance |  | $ 387
Post-Modification Recorded Balance |  | $ 387
Number of Loans | loan |  | 3
Commercial and farmland |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance | $ 85 | $ 1,022
Post-Modification Recorded Balance | $ 85 | $ 1,156
Number of Loans | loan | 1 | 8
Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance | $ 490 | $ 788
Post-Modification Recorded Balance | $ 487 | $ 862
Number of Loans | loan | 11 | 15
Home equity |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance | $ 81 | $ 195
Post-Modification Recorded Balance | $ 81 | $ 107
Number of Loans | loan | 3 | 4
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance | $ 65 | $ 13
Post-Modification Recorded Balance | $ 66 | $ 14
Number of Loans | loan | 3 | 1

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