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Loans and Allowance - Credit Quality of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 8,606,849 | $ 8,459,310
Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,199,226 | 2,109,879
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 87,421 | 93,861
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 643,674 | 787,568
Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 3,268,168 | 3,052,698
Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,121,556 | 1,143,217
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 570,398 | 588,984
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 129,765 | 135,989
Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 586,641 | 547,114
Commercial Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 6,618,263 | 6,447,193
Commercial Pass | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,024,943 | 1,956,985
Commercial Pass | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 70,365 | 78,558
Commercial Pass | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 591,599 | 749,249
Commercial Pass | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 3,120,084 | 2,894,366
Commercial Pass | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 200,792 | 196,710
Commercial Pass | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 24,273 | 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 | 586,207 | 547,114
Commercial Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 170,639 | 147,328
Commercial Special Mention | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 93,686 | 81,179
Commercial Special Mention | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 5,962 | 5,626
Commercial Special Mention | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 20,043 | 1,613
Commercial Special Mention | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 49,714 | 57,776
Commercial Special Mention | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 395 | 877
Commercial Special Mention | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 405 | 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 | 434 | 0
Commercial Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 196,841 | 190,358
Commercial Substandard | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 80,597 | 71,715
Commercial Substandard | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 11,094 | 9,677
Commercial Substandard | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,466 | 1,634
Commercial Substandard | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 96,451 | 98,575
Commercial Substandard | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 6,439 | 8,075
Commercial Substandard | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 794 | 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 production financing 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 and farmland |  |
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 production financing 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 and farmland |  |
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 | 1,615,465 | 1,668,247
Consumer Performing | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Performing | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Performing | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 30,449 | 35,072
Consumer Performing | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,919 | 1,981
Consumer Performing | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 909,813 | 932,743
Consumer Performing | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 543,579 | 562,507
Consumer Performing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 129,705 | 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 | 5,641 | 6,184
Consumer Non-Performing | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Non-Performing | Agricultural production financing 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 | 117 | 0
Consumer Non-Performing | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer Non-Performing | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 4,117 | 4,812
Consumer Non-Performing | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,347 | 1,327
Consumer Non-Performing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 60 | 45
Consumer Non-Performing | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 0 | $ 0

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