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Loans and Allowance for Credit Losses - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 9,241,861 | $ 9,243,174
Loans > 90 Days or More Past Due And Accruing | 963 | 746
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,207,113 | 9,170,399
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,006 | 19,638
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,056 | 11,187
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,686 | 41,950
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,714,565 | 2,776,699
Loans > 90 Days or More Past Due And Accruing | 675 | 594
Commercial and industrial loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,708,539 | 2,761,473
Commercial and industrial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,602 | 5,866
Commercial and industrial loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,437 | 6,571
Commercial and industrial loans | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 987 | 2,789
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 246,442 | 281,884
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 | 246,380 | 280,615
Agricultural land, production and other loans to farmers | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 36 | 146
Agricultural land, production and other loans to farmers | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 226
Agricultural land, production and other loans to farmers | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 26 | 897
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 523,066 | 484,723
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Construction | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 522,349 | 484,706
Construction | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 717 | 0
Construction | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 17
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 | 2,135,459 | 2,220,949
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 | 2,124,853 | 2,184,681
Commercial real estate, non-owner occupied | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,327 | 2,525
Commercial real estate, non-owner occupied | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 2,109
Commercial real estate, non-owner occupied | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,279 | 31,634
Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 986,720 | 958,501
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Commercial real estate, owner occupied | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 985,785 | 951,561
Commercial real estate, owner occupied | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 643 | 4,854
Commercial real estate, owner occupied | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 180
Commercial real estate, owner occupied | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 292 | 1,906
Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,159,127 | 1,234,741
Loans > 90 Days or More Past Due And Accruing | 0 | 133
Residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,148,294 | 1,226,779
Residential | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,979 | 3,269
Residential | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,255 | 1,429
Residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,599 | 3,264
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 523,754 | 508,259
Loans > 90 Days or More Past Due And Accruing | 288 | 19
Home equity | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 518,643 | 503,596
Home equity | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,327 | 2,644
Home equity | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 281 | 559
Home equity | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,503 | 1,460
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 146,092 | 129,479
Loans > 90 Days or More Past Due And Accruing | 0 | 0
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 145,634 | 129,049
Consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 375 | 334
Consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 83 | 96
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 806,636 | 647,939
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 | 806,636 | 647,939
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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