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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 9,212,238 | $ 9,170,399
Loans | 9,318,228 | 9,243,174
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,870,436 | 2,761,473
Loans | 2,876,212 | 2,776,699
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 244,403 | 280,615
Loans | 245,631 | 281,884
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 540,648 | 484,706
Loans | 541,224 | 484,723
Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,094,103 | 2,184,681
Loans | 2,178,832 | 2,220,949
Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 946,423 | 951,561
Loans | 950,038 | 958,501
Residential Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,234,473 | 1,226,779
Loans | 1,239,925 | 1,234,741
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 477,927 | 503,596
Loans | 482,229 | 508,259
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 126,075 | 129,049
Loans | 126,387 | 129,479
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 677,750 | 647,939
Loans | 677,750 | 647,939
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 55,622 | 19,638
30-59 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4,545 | 5,866
30-59 Days Past Due | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 114 | 146
30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 560 | 0
30-59 Days Past Due | Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 45,942 | 2,525
30-59 Days Past Due | Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 792 | 4,854
30-59 Days Past Due | Residential Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,582 | 3,269
30-59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,906 | 2,644
30-59 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 181 | 334
30-59 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,978 | 11,187
60-89 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 19 | 6,571
60-89 Days Past Due | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 226
60-89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 17
60-89 Days Past Due | Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 434 | 2,109
60-89 Days Past Due | Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,096 | 180
60-89 Days Past Due | Residential Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 377 | 1,429
60-89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,010 | 559
60-89 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 42 | 96
60-89 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 47,390 | 41,950
Loans > 90 Days or More Past Due And Accruing | 1,093 | 746
90 Days or More Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,212 | 2,789
Loans > 90 Days or More Past Due And Accruing | 0 | 594
90 Days or More Past Due | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,114 | 897
Loans > 90 Days or More Past Due And Accruing | 0 | 0
90 Days or More Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 16 | 0
Loans > 90 Days or More Past Due And Accruing | 0 | 0
90 Days or More Past Due | Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 38,353 | 31,634
Loans > 90 Days or More Past Due And Accruing | 0 | 0
90 Days or More Past Due | Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,727 | 1,906
Loans > 90 Days or More Past Due And Accruing | 1,032 | 0
90 Days or More Past Due | Residential Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3,493 | 3,264
Loans > 90 Days or More Past Due And Accruing | 0 | 133
90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,386 | 1,460
Loans > 90 Days or More Past Due And Accruing | 60 | 19
90 Days or More Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 89 | 0
Loans > 90 Days or More Past Due And Accruing | 1 | 0
90 Days or More Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans > 90 Days or More Past Due And Accruing | $ 0 | $ 0

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