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Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 9,318,228 | $ 9,243,174
Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,876,212 | 2,776,699
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 245,631 | 281,884
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 541,224 | 484,723
Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,178,832 | 2,220,949
Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 950,038 | 958,501
Residential Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,239,925 | 1,234,741
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 482,229 | 508,259
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 126,387 | 129,479
Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 677,750 | $ 647,939

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