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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 8,482,975 | $ 8,427,414
Non-Accrual | 15,649 | 15,949
Total Past Due & Non-Accrual | 123,874 | 31,896
Total | 8,606,849 | 8,459,310
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,175,423 | 2,105,445
Non-Accrual | 1,759 | 1,255
Total Past Due & Non-Accrual | 23,803 | 4,434
Total | 2,199,226 | 2,109,879
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 86,566 | 93,678
Non-Accrual | 0 | 183
Total Past Due & Non-Accrual | 855 | 183
Total | 87,421 | 93,861
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 622,171 | 784,961
Non-Accrual | 1,094 | 977
Total Past Due & Non-Accrual | 21,503 | 2,607
Total | 643,674 | 787,568
Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 3,204,303 | 3,043,318
Non-Accrual | 6,995 | 7,007
Total Past Due & Non-Accrual | 63,865 | 9,380
Total | 3,268,168 | 3,052,698
Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,112,523 | 1,133,476
Non-Accrual | 4,332 | 5,062
Total Past Due & Non-Accrual | 9,033 | 9,741
Total | 1,121,556 | 1,143,217
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 566,018 | 584,023
Non-Accrual | 1,409 | 1,421
Total Past Due & Non-Accrual | 4,380 | 4,961
Total | 570,398 | 588,984
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 129,330 | 135,399
Non-Accrual | 60 | 44
Total Past Due & Non-Accrual | 435 | 590
Total | 129,765 | 135,989
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 586,641 | 547,114
Non-Accrual | 0 | 0
Total Past Due & Non-Accrual | 0 |
Total | 586,641 | 547,114
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 100,677 | 14,683
30-59 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 21,717 | 3,039
30-59 Days Past Due | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 855 | 0
30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 19,542 | 1,630
30-59 Days Past Due | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 51,516 | 2,324
30-59 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4,536 | 4,290
30-59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,191 | 2,960
30-59 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 320 | 440
30-59 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 7,236 | 1,195
60-89 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 119 | 136
60-89 Days Past Due | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60-89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 867 | 0
60-89 Days Past Due | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 5,354 | 49
60-89 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 133 | 367
60-89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 708 | 538
60-89 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 55 | 105
60-89 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans 90 Days or More Past Due And Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 312 | 69
Loans 90 Days or More Past Due And Accruing | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 208 | 4
Loans 90 Days or More Past Due And Accruing | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans 90 Days or More Past Due And Accruing | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans 90 Days or More Past Due And Accruing | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans 90 Days or More Past Due And Accruing | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 32 | 22
Loans 90 Days or More Past Due And Accruing | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 72 | 42
Loans 90 Days or More Past Due And Accruing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 1
Loans 90 Days or More Past Due And Accruing | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 0 | $ 0

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