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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 9,156,460 | $ 8,427,414
Non-Accrual | 56,739 | 15,949
Total Past Due & Non-Accrual | 87,373 | 31,896
Total | 9,243,833 | 8,459,310
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,864,852 | 2,105,445
Non-Accrual | 5,947 | 1,255
Total Past Due & Non-Accrual | 10,479 | 4,434
Total | 2,875,331 | 2,109,879
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 81,990 | 93,678
Non-Accrual | 0 | 183
Total Past Due & Non-Accrual | 1,100 | 183
Total | 83,090 | 93,861
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 614,383 | 784,961
Non-Accrual | 126 | 977
Total Past Due & Non-Accrual | 7,701 | 2,607
Total | 622,084 | 787,568
Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 3,194,394 | 3,043,318
Non-Accrual | 43,030 | 7,007
Total Past Due & Non-Accrual | 54,112 | 9,380
Total | 3,248,506 | 3,052,698
Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,137,688 | 1,133,476
Non-Accrual | 4,914 | 5,062
Total Past Due & Non-Accrual | 8,718 | 9,741
Total | 1,146,406 | 1,143,217
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 522,680 | 584,023
Non-Accrual | 2,674 | 1,421
Total Past Due & Non-Accrual | 4,778 | 4,961
Total | 527,458 | 588,984
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 124,926 | 135,399
Non-Accrual | 48 | 44
Total Past Due & Non-Accrual | 485 | 590
Total | 125,411 | 135,989
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 615,547 | 547,114
Non-Accrual | 0 | 0
Total Past Due & Non-Accrual | 0 |
Total | 615,547 | 547,114
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 17,527 | 14,683
30-59 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4,529 | 3,039
30-59 Days Past Due | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 7,575 | 1,630
30-59 Days Past Due | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 964 | 2,324
30-59 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,743 | 4,290
30-59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,467 | 2,960
30-59 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 249 | 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 | 11,777 | 1,195
60-89 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 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 | 0 | 0
60-89 Days Past Due | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 9,978 | 49
60-89 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,000 | 367
60-89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 611 | 538
60-89 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 188 | 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 | 1,330 | 69
Loans 90 Days or More Past Due And Accruing | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3 | 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 | 1,100 | 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 | 140 | 0
Loans 90 Days or More Past Due And Accruing | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 61 | 22
Loans 90 Days or More Past Due And Accruing | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 26 | 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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