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Loans and Allowance - Credit Quality of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 8,299,260 | $ 7,224,467
Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,034,311 | 1,726,664
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 90,462 | 92,404
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 670,138 | 545,729
Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 3,144,649 | 2,832,102
Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,155,403 | 966,421
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 601,335 | 528,157
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 131,246 | 99,788
Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 471,716 | 433,202
Commercial Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 6,296,426 | 5,528,751
Commercial Pass | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,923,043 | 1,660,879
Commercial Pass | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 70,715 | 78,446
Commercial Pass | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 638,040 | 492,358
Commercial Pass | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,963,113 | 2,669,491
Commercial Pass | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 198,986 | 170,075
Commercial Pass | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 30,813 | 24,653
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 | 471,716 | 432,849
Commercial Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 145,230 | 115,342
Commercial Special Mention | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 62,219 | 23,246
Commercial Special Mention | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 5,681 | 5,966
Commercial Special Mention | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 288 | 2,185
Commercial Special Mention | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 73,429 | 76,037
Commercial Special Mention | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 3,492 | 7,373
Commercial Special Mention | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 121 | 535
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 | 173,496 | 161,929
Commercial Substandard | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 48,719 | 42,539
Commercial Substandard | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 13,867 | 7,992
Commercial Substandard | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,818 | 24,224
Commercial Substandard | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 101,025 | 84,288
Commercial Substandard | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 7,195 | 2,076
Commercial Substandard | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 872 | 457
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 | 353
Commercial Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 329 | 0
Commercial Doubtful | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 329 | 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 | 1 | 0
Commercial Loss | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1 | 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 | 1,676,894 | 1,410,521
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 | 199 | 0
Consumer Performing | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 29,992 | 25,419
Consumer Performing | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 7,082 | 2,285
Consumer Performing | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 940,613 | 782,080
Consumer Performing | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 567,865 | 500,996
Consumer Performing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 131,143 | 99,741
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 | 6,884 | 7,924
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 | 0 | 1,543
Consumer Non-Performing | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 1
Consumer Non-Performing | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 5,117 | 4,817
Consumer Non-Performing | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,664 | 1,516
Consumer Non-Performing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 103 | 47
Consumer Non-Performing | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 0 | $ 0

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