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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 9,356,241 | $ 9,241,861
Loans > 90 Days or More Past Due And Accruing | 2,085 | 963
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,304,687 | 9,207,113
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 28,580 | 15,006
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,780 | 7,056
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,194 | 12,686
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,826,660 | 2,714,565
Loans > 90 Days or More Past Due And Accruing | 1,424 | 675
Commercial and industrial loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,807,708 | 2,708,539
Commercial and industrial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,181 | 2,602
Commercial and industrial loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,862 | 2,437
Commercial and industrial loans | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,909 | 987
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 209,077 | 246,442
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Agricultural land, production and other loans to farmers | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 209,050 | 246,380
Agricultural land, production and other loans to farmers | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 36
Agricultural land, production and other loans to farmers | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Agricultural land, production and other loans to farmers | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 27 | 26
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 552,975 | 523,066
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Construction | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 552,866 | 522,349
Construction | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 717
Construction | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 109 | 0
Construction | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,073,197 | 2,135,459
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Commercial real estate, non-owner occupied | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,057,043 | 2,124,853
Commercial real estate, non-owner occupied | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,851 | 3,327
Commercial real estate, non-owner occupied | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Commercial real estate, non-owner occupied | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,303 | 7,279
Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 974,521 | 986,720
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Commercial real estate, owner occupied | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 973,075 | 985,785
Commercial real estate, owner occupied | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,182 | 643
Commercial real estate, owner occupied | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 27 | 0
Commercial real estate, owner occupied | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 237 | 292
Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,226,695 | 1,159,127
Loans > 90 Days or More Past Due And Accruing | 132 | 0
Residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,217,155 | 1,148,294
Residential | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,697 | 3,979
Residential | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 713 | 4,255
Residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,130 | 2,599
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 512,641 | 523,754
Loans > 90 Days or More Past Due And Accruing | 527 | 288
Home equity | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 507,837 | 518,643
Home equity | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,219 | 3,327
Home equity | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 999 | 281
Home equity | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,586 | 1,503
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 147,593 | 146,092
Loans > 90 Days or More Past Due And Accruing | 2 | 0
Individuals' loans for household and other personal expenditures | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 147,071 | 145,634
Individuals' loans for household and other personal expenditures | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 450 | 375
Individuals' loans for household and other personal expenditures | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 70 | 83
Individuals' loans for household and other personal expenditures | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2 | 0
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 832,882 | 806,636
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Public finance and other commercial loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 832,882 | 806,636
Public finance and other commercial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Public finance and other commercial loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Public finance and other commercial loans | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 0 | $ 0

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