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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | $ 183 | $ 746
Loans | 9,121,250 | 9,243,174
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | 0 | 594
Loans | 2,671,076 | 2,776,699
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Loans | 235,020 | 281,884
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Loans | 491,200 | 484,723
Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Loans | 2,263,497 | 2,220,949
Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Loans | 953,501 | 958,501
Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | 183 | 133
Loans | 1,127,442 | 1,234,741
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | 0 | 19
Loans | 489,997 | 508,259
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Loans | 130,819 | 129,479
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Loans | 758,698 | 647,939
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,052,818 | 9,170,399
Current | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,658,952 | 2,761,473
Current | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 234,432 | 280,615
Current | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 491,200 | 484,706
Current | Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,221,577 | 2,184,681
Current | Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 949,949 | 951,561
Current | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,121,721 | 1,226,779
Current | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 487,075 | 503,596
Current | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 129,214 | 129,049
Current | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 758,698 | 647,939
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,007 | 19,638
30-59 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 6,336 | 5,866
30-59 Days Past Due | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 146
30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
30-59 Days Past Due | Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 39 | 2,525
30-59 Days Past Due | Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,127 | 4,854
30-59 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,276 | 3,269
30-59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 832 | 2,644
30-59 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,397 | 334
30-59 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,634 | 11,187
60-89 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,590 | 6,571
60-89 Days Past Due | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 226
60-89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 17
60-89 Days Past Due | Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,364 | 2,109
60-89 Days Past Due | Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 180
60-89 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 347 | 1,429
60-89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,125 | 559
60-89 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 208 | 96
60-89 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 43,791 | 41,950
90 Days or More Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,198 | 2,789
90 Days or More Past Due | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 588 | 897
90 Days or More Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
90 Days or More Past Due | Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 36,517 | 31,634
90 Days or More Past Due | Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,425 | 1,906
90 Days or More Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,098 | 3,264
90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 965 | 1,460
90 Days or More Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
90 Days or More Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 0 | $ 0

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