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Loans and Allowance - Summary of Non-Accrual Loans by Loan Class (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 26,148 | $ 28,724
Commercial and industrial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 1,803 | 3,275
Agriculture production financing and other loans to farmers |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 679 | 1,027
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 8,667 | 65
Commercial and farmland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 8,156 | 12,951
Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 4,966 | 9,444
Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 1,481 | 1,928
Individuals' loans for household and other personal expenditures |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 42 | 34
Other commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 354 |

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