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Loans and Allowance for Loan Losses - Schedule of Current, Accruing Past Due, and Non-Accrual Loans by Portfolio Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs $ 44,625,627 $ 42,609,028
Non-accrual with an ALL 248,506 271,174
Non-accrual without an ALL 7,751 37,990
Accrued interest receivable $ 214,700 $ 217,100
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Deferred loan costs (fees) $ (46,700) $ (34,100)
Commercial & Industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 24,288,664 22,331,129
Non-accrual with an ALL 146,543 119,264
Non-accrual without an ALL 4,949 37,990
Commercial & Industrial | Commercial, financial, and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 16,174,745 14,498,992
Non-accrual with an ALL 120,713 98,145
Non-accrual without an ALL 4,582 24,729
Commercial & Industrial | Owner-occupied    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 8,113,919 7,832,137
Non-accrual with an ALL 25,830 21,119
Non-accrual without an ALL 367 13,261
Commercial Real Estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 12,097,395 12,014,619
Non-accrual with an ALL 37,589 77,804
Non-accrual without an ALL 1,021 0
Commercial Real Estate | Investment properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 11,279,922 11,181,204
Non-accrual with an ALL 34,679 74,030
Non-accrual without an ALL 989 0
Commercial Real Estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 542,178 545,918
Non-accrual with an ALL 2,728 2,385
Non-accrual without an ALL 32 0
Commercial Real Estate | Land and development    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 275,295 287,497
Non-accrual with an ALL 182 1,389
Non-accrual without an ALL 0 0
Consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 8,239,568 8,263,280
Non-accrual with an ALL 64,374 74,106
Non-accrual without an ALL 1,781 0
Consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,212,860 5,288,776
Non-accrual with an ALL 45,354 50,834
Non-accrual without an ALL 1,618 0
Consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,844,991 1,831,287
Non-accrual with an ALL 13,024 17,365
Non-accrual without an ALL 163 0
Consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 185,828 185,871
Non-accrual with an ALL 0 0
Non-accrual without an ALL 0 0
Consumer | Other consumer loans    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 995,889 957,346
Non-accrual with an ALL 5,996 5,907
Non-accrual without an ALL 0 0
Current    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 44,306,666 42,190,986
Current | Commercial & Industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 24,111,935 22,106,891
Current | Commercial & Industrial | Commercial, financial, and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 16,029,058 14,352,839
Current | Commercial & Industrial | Owner-occupied    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 8,082,877 7,754,052
Current | Commercial Real Estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 12,055,904 11,931,858
Current | Commercial Real Estate | Investment properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 11,243,037 11,105,168
Current | Commercial Real Estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 538,285 541,897
Current | Commercial Real Estate | Land and development    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 274,582 284,793
Current | Consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 8,138,827 8,152,237
Current | Consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,160,701 5,228,580
Current | Consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,816,272 1,800,614
Current | Consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 182,283 182,435
Current | Consumer | Other consumer loans    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 979,571 940,608
Accruing 30-89 Days Past Due    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 58,423 60,286
Accruing 30-89 Days Past Due | Commercial & Industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 22,746 20,647
Accruing 30-89 Days Past Due | Commercial & Industrial | Commercial, financial, and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 17,901 12,947
Accruing 30-89 Days Past Due | Commercial & Industrial | Owner-occupied    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 4,845 7,700
Accruing 30-89 Days Past Due | Commercial Real Estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 2,863 4,755
Accruing 30-89 Days Past Due | Commercial Real Estate | Investment properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,217 2,006
Accruing 30-89 Days Past Due | Commercial Real Estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,115 1,636
Accruing 30-89 Days Past Due | Commercial Real Estate | Land and development    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 531 1,113
Accruing 30-89 Days Past Due | Consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 32,814 34,884
Accruing 30-89 Days Past Due | Consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,187 9,362
Accruing 30-89 Days Past Due | Consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 15,532 13,131
Accruing 30-89 Days Past Due | Consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,773 1,573
Accruing 30-89 Days Past Due | Consumer | Other consumer loans    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 10,322 10,818
Accruing 90 Days or Greater Past Due    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 4,281 48,592
Accruing 90 Days or Greater Past Due | Commercial & Industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 2,491 46,337
Accruing 90 Days or Greater Past Due | Commercial & Industrial | Commercial, financial, and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 2,491 10,332
Accruing 90 Days or Greater Past Due | Commercial & Industrial | Owner-occupied    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 0 36,005
Accruing 90 Days or Greater Past Due | Commercial Real Estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 18 202
Accruing 90 Days or Greater Past Due | Commercial Real Estate | Investment properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 0 0
Accruing 90 Days or Greater Past Due | Commercial Real Estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 18 0
Accruing 90 Days or Greater Past Due | Commercial Real Estate | Land and development    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 0 202
Accruing 90 Days or Greater Past Due | Consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,772 2,053
Accruing 90 Days or Greater Past Due | Consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 0 0
Accruing 90 Days or Greater Past Due | Consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 0 177
Accruing 90 Days or Greater Past Due | Consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,772 1,863
Accruing 90 Days or Greater Past Due | Consumer | Other consumer loans    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 0 13
Total Accruing Past Due    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 62,704 108,878
Total Accruing Past Due | Commercial & Industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 25,237 66,984
Total Accruing Past Due | Commercial & Industrial | Commercial, financial, and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 20,392 23,279
Total Accruing Past Due | Commercial & Industrial | Owner-occupied    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 4,845 43,705
Total Accruing Past Due | Commercial Real Estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 2,881 4,957
Total Accruing Past Due | Commercial Real Estate | Investment properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,217 2,006
Total Accruing Past Due | Commercial Real Estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,133 1,636
Total Accruing Past Due | Commercial Real Estate | Land and development    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 531 1,315
Total Accruing Past Due | Consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 34,586 36,937
Total Accruing Past Due | Consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,187 9,362
Total Accruing Past Due | Consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 15,532 13,308
Total Accruing Past Due | Consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 3,545 3,436
Total Accruing Past Due | Consumer | Other consumer loans    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs $ 10,322 $ 10,831