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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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