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Loans and Allowance - Summary of Non-Accrual Loans by Loan Class (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 27,949 | $ 26,148
Commercial and industrial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 2,498 | 1,803
Agricultural production financing and other loans to farmers |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 2,910 | 679
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 7,533 | 8,667
Commercial and farmland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 8,201 | 8,156
Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 4,473 | 4,966
Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 1,963 | 1,481
Individuals' loans for household and other personal expenditures |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 18 | 42
Public finance and other commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 353 | $ 354

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