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Loans and Allowance - Summary of Non-Accrual Loans by Loan Class (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 56,739 | $ 15,949
Commercial and industrial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 5,947 | 1,255
Agricultural production financing and other loans to farmers |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 0 | 183
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 126 | 977
Commercial and farmland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 43,030 | 7,007
Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 4,914 | 5,062
Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 2,674 | 1,421
Individuals' loans for household and other personal expenditures |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 48 | $ 44

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