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Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 9,041,576 | $ 9,243,174
Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,573,615 | 2,776,699
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 240,686 | 281,884
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 521,889 | 484,723
Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,150,387 | 2,220,949
Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 952,441 | 958,501
Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,154,373 | 1,234,741
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 531,307 | 508,259
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 135,093 | 129,479
Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 781,785 | $ 647,939

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