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Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 11,397,417 | $ 9,241,861
Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 3,297,477 | 2,714,565
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 214,904 | 246,442
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 745,983 | 523,066
Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,423,185 | 2,135,459
Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,264,563 | 986,720
Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,813,297 | 1,159,127
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 586,108 | 523,754
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 157,264 | 146,092
Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 894,636 | $ 806,636

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