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Loans and Allowance - Credit Quality of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 9,243,174 | $ 8,459,310
Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,776,699 | 2,109,879
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 281,884 | 334,172
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 484,723 | 787,568
Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,220,949 | 1,902,692
Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 958,501 | 909,695
Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,234,741 | 1,143,217
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 508,259 | 588,984
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 129,479 | 135,989
Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 647,939 | 547,114
Commercial Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 7,000,298 | 6,447,193
Commercial Pass | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,562,077 | 1,956,985
Commercial Pass | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 243,991 | 291,790
Commercial Pass | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 446,846 | 749,249
Commercial Pass | Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,979,827 | 1,814,187
Commercial Pass | Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 907,566 | 866,947
Commercial Pass | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 199,338 | 196,710
Commercial Pass | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 12,714 | 24,211
Commercial Pass | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Pass | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 647,939 | 547,114
Commercial Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 334,989 | 147,328
Commercial Special Mention | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 117,503 | 81,179
Commercial Special Mention | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 26,835 | 11,008
Commercial Special Mention | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 10,445 | 1,613
Commercial Special Mention | Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 160,304 | 38,366
Commercial Special Mention | Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 17,641 | 14,028
Commercial Special Mention | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,261 | 877
Commercial Special Mention | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 257
Commercial Special Mention | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Special Mention | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 234,712 | 190,358
Commercial Substandard | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 97,119 | 71,715
Commercial Substandard | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 9,885 | 29,393
Commercial Substandard | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 5,549 | 1,634
Commercial Substandard | Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 80,818 | 50,139
Commercial Substandard | Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 33,294 | 28,720
Commercial Substandard | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 7,058 | 8,075
Commercial Substandard | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 989 | 682
Commercial Substandard | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Substandard | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful | Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful | Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Doubtful | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss | Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss | Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial Loss | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,666,062 | 1,668,247
Consumer Performing | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Performing | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,173 | 1,981
Consumer Performing | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 21,763 | 35,072
Consumer Performing | Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Performing | Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Performing | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,020,687 | 932,743
Consumer Performing | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 492,999 | 562,507
Consumer Performing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 129,440 | 135,944
Consumer Performing | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Non Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 7,113 | 6,184
Consumer Non Performing | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Non Performing | Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Non Performing | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 120 | 0
Consumer Non Performing | Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Non Performing | Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Non Performing | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 5,397 | 4,812
Consumer Non Performing | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,557 | 1,327
Consumer Non Performing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 39 | 45
Consumer Non Performing | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 0 | $ 0

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