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Loans and Allowance - Summary of Non-Accrual Loans by Loan Class (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual Loans | $ 57,923 | $ 61,471
Non-Accrual Loans with no Allowance for Credit Losses | 5,548 |
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual Loans | 1,671 | 2,329
Non-Accrual Loans with no Allowance for Credit Losses | 786 |
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual Loans | 1,220 | 1,012
Non-Accrual Loans with no Allowance for Credit Losses | 561 |
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual Loans | 18 | 123
Non-Accrual Loans with no Allowance for Credit Losses | 0 |
Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual Loans | 44,143 | 46,316
Non-Accrual Loans with no Allowance for Credit Losses | 1,853 |
Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual Loans | 1,760 | 3,040
Non-Accrual Loans with no Allowance for Credit Losses | 1,513 |
Residential Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual Loans | 6,336 | 6,517
Non-Accrual Loans with no Allowance for Credit Losses | 835 |
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual Loans | 2,650 | 2,095
Non-Accrual Loans with no Allowance for Credit Losses | 0 |
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual Loans | 125 | $ 39
Non-Accrual Loans with no Allowance for Credit Losses | $ 0 |

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