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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