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