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Loans and Allowance - Credit Quality of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 7,511,370 | $ 7,224,467
Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,877,042 | 1,726,664
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 83,452 | 92,404
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 624,548 | 545,729
Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,821,689 | 2,832,102
Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 993,802 | 966,421
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 548,006 | 528,157
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 98,384 | 99,788
Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 464,447 | 433,202
Commercial Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 5,734,217 | 5,528,751
Commercial Pass | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,781,040 | 1,660,879
Commercial Pass | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 67,837 | 78,446
Commercial Pass | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 591,962 | 492,358
Commercial Pass | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,645,338 | 2,669,491
Commercial Pass | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 156,622 | 170,075
Commercial Pass | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 27,324 | 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 | 464,094 | 432,849
Commercial Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 146,333 | 115,342
Commercial Special Mention | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 53,407 | 23,246
Commercial Special Mention | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 5,478 | 5,966
Commercial Special Mention | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,444 | 2,185
Commercial Special Mention | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 79,586 | 76,037
Commercial Special Mention | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 5,833 | 7,373
Commercial Special Mention | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 585 | 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 | 158,830 | 161,929
Commercial Substandard | Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 42,266 | 42,539
Commercial Substandard | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 10,137 | 7,992
Commercial Substandard | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 7,712 | 24,224
Commercial Substandard | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 94,179 | 84,288
Commercial Substandard | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 3,425 | 2,076
Commercial Substandard | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 758 | 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 | 353 | 353
Commercial Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 779 | 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 | 450 | 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 | 1,464,815 | 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 | 0 | 0
Consumer Performing | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 23,430 | 25,419
Consumer Performing | Commercial and farmland |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,136 | 2,285
Consumer Performing | Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 823,309 | 782,080
Consumer Performing | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 517,620 | 500,996
Consumer Performing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 98,320 | 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 | 6,396 | 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 |  | 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 | 4,613 | 4,817
Consumer Non-Performing | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,719 | 1,516
Consumer Non-Performing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 64 | 47
Consumer Non-Performing | Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 0 | $ 0

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