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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 9,181,552 | $ 8,427,414
Non-Accrual | 50,102 | 15,949
Total Past Due & Non-Accrual | 116,989 | 31,896
Total | 9,298,541 | 8,459,310
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,871,366 | 2,105,445
Non-Accrual | 16,354 | 1,255
Total Past Due & Non-Accrual | 26,963 | 4,434
Total | 2,898,329 | 2,109,879
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 92,735 | 93,678
Non-Accrual | 0 | 183
Total Past Due & Non-Accrual | 1,103 | 183
Total | 93,838 | 93,861
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 634,706 | 784,961
Non-Accrual | 119 | 977
Total Past Due & Non-Accrual | 5,854 | 2,607
Total | 640,560 | 787,568
Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 3,172,688 | 3,043,318
Non-Accrual | 25,405 | 7,007
Total Past Due & Non-Accrual | 67,310 | 9,380
Total | 3,239,998 | 3,052,698
Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,136,131 | 1,133,476
Non-Accrual | 5,773 | 5,062
Total Past Due & Non-Accrual | 9,056 | 9,741
Total | 1,145,187 | 1,143,217
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 526,096 | 584,023
Non-Accrual | 2,376 | 1,421
Total Past Due & Non-Accrual | 6,218 | 4,961
Total | 532,314 | 588,984
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 123,126 | 135,399
Non-Accrual | 75 | 44
Total Past Due & Non-Accrual | 485 | 590
Total | 123,611 | 135,989
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 624,704 | 547,114
Non-Accrual | 0 | 0
Total Past Due & Non-Accrual | 0 |
Total | 624,704 | 547,114
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 39,737 | 14,683
30-59 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 9,435 | 3,039
30-59 Days Past Due | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,103 | 0
30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 5,235 | 1,630
30-59 Days Past Due | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 18,948 | 2,324
30-59 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,679 | 4,290
30-59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,110 | 2,960
30-59 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 227 | 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 | 22,169 | 1,195
60-89 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,038 | 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 | 500 | 0
60-89 Days Past Due | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 18,458 | 49
60-89 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 329 | 367
60-89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,673 | 538
60-89 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 171 | 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 | 4,981 | 69
Loans 90 Days or More Past Due And Accruing | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 136 | 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 | 4,499 | 0
Loans 90 Days or More Past Due And Accruing | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 275 | 22
Loans 90 Days or More Past Due And Accruing | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 59 | 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 | 12 | 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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