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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
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs $ 43,753,234 $ 42,609,028
Non-accrual with an ALL 201,924 271,174
Non-accrual without an ALL 7,403 37,990
Accrued interest receivable $ 216,300 $ 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) $ (41,000) $ (34,100)
Total commercial and industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 23,228,969 22,331,129
Non-accrual with an ALL 93,702 119,264
Non-accrual without an ALL 5,170 37,990
Total commercial and industrial | Commercial, financial and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 15,360,223 14,498,992
Non-accrual with an ALL 84,282 98,145
Non-accrual without an ALL 4,813 24,729
Total commercial and industrial | Owner-occupied    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 7,868,746 7,832,137
Non-accrual with an ALL 9,420 21,119
Non-accrual without an ALL 357 13,261
Total commercial real estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 12,269,740 12,014,619
Non-accrual with an ALL 37,624 77,804
Non-accrual without an ALL 1,043 0
Total commercial real estate | Investment properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 11,462,107 11,181,204
Non-accrual with an ALL 34,768 74,030
Non-accrual without an ALL 1,043 0
Total commercial real estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 548,327 545,918
Non-accrual with an ALL 2,144 2,385
Non-accrual without an ALL 0 0
Total commercial real estate | Land and development    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 259,306 287,497
Non-accrual with an ALL 712 1,389
Non-accrual without an ALL 0 0
Total consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 8,254,525 8,263,280
Non-accrual with an ALL 70,598 74,106
Non-accrual without an ALL 1,190 0
Total consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,237,683 5,288,776
Non-accrual with an ALL 44,414 50,834
Non-accrual without an ALL 579 0
Total consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,842,126 1,831,287
Non-accrual with an ALL 20,189 17,365
Non-accrual without an ALL 611 0
Total consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 176,367 185,871
Non-accrual with an ALL 0 0
Non-accrual without an ALL 0 0
Total consumer | Other consumer loans    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 998,349 957,346
Non-accrual with an ALL 5,995 5,907
Non-accrual without an ALL 0 0
Current    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 43,499,724 42,190,986
Current | Total commercial and industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 23,117,245 22,106,891
Current | Total commercial and industrial | Commercial, financial and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 15,263,978 14,352,839
Current | Total commercial and industrial | Owner-occupied    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 7,853,267 7,754,052
Current | Total commercial real estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 12,228,497 11,931,858
Current | Total commercial real estate | Investment properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 11,424,644 11,105,168
Current | Total commercial real estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 545,699 541,897
Current | Total commercial real estate | Land and development    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 258,154 284,793
Current | Total consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 8,153,982 8,152,237
Current | Total consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,186,944 5,228,580
Current | Total consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,811,056 1,800,614
Current | Total consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 173,199 182,435
Current | Total consumer | Other consumer loans    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 982,783 940,608
Accruing 30-89 Days Past Due    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 40,382 60,286
Accruing 30-89 Days Past Due | Total commercial and industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 10,857 20,647
Accruing 30-89 Days Past Due | Total commercial and industrial | Commercial, financial and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,155 12,947
Accruing 30-89 Days Past Due | Total commercial and industrial | Owner-occupied    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,702 7,700
Accruing 30-89 Days Past Due | Total commercial real estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 2,576 4,755
Accruing 30-89 Days Past Due | Total commercial real estate | Investment properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,652 2,006
Accruing 30-89 Days Past Due | Total commercial real estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 484 1,636
Accruing 30-89 Days Past Due | Total commercial real estate | Land and development    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 440 1,113
Accruing 30-89 Days Past Due | Total consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 26,949 34,884
Accruing 30-89 Days Past Due | Total consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,746 9,362
Accruing 30-89 Days Past Due | Total consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 10,106 13,131
Accruing 30-89 Days Past Due | Total consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,526 1,573
Accruing 30-89 Days Past Due | Total consumer | Other consumer loans    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 9,571 10,818
Accruing 90 Days or Greater Past Due    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 3,801 48,592
Accruing 90 Days or Greater Past Due | Total commercial and industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,995 46,337
Accruing 90 Days or Greater Past Due | Total commercial and industrial | Commercial, financial and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,995 10,332
Accruing 90 Days or Greater Past Due | Total commercial and 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 | Total commercial real estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 0 202
Accruing 90 Days or Greater Past Due | Total 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 | Total commercial real estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 0 0
Accruing 90 Days or Greater Past Due | Total 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 | Total consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,806 2,053
Accruing 90 Days or Greater Past Due | Total consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 0 0
Accruing 90 Days or Greater Past Due | Total consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 164 177
Accruing 90 Days or Greater Past Due | Total consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,642 1,863
Accruing 90 Days or Greater Past Due | Total 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 44,183 108,878
Total Accruing Past Due | Total commercial and industrial    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 12,852 66,984
Total Accruing Past Due | Total commercial and industrial | Commercial, financial and agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 7,150 23,279
Total Accruing Past Due | Total commercial and industrial | Owner-occupied    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,702 43,705
Total Accruing Past Due | Total commercial real estate    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 2,576 4,957
Total Accruing Past Due | Total commercial real estate | Investment properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 1,652 2,006
Total Accruing Past Due | Total commercial real estate | 1-4 family properties    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 484 1,636
Total Accruing Past Due | Total commercial real estate | Land and development    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 440 1,315
Total Accruing Past Due | Total consumer    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 28,755 36,937
Total Accruing Past Due | Total consumer | Consumer mortgages    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 5,746 9,362
Total Accruing Past Due | Total consumer | Home equity    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 10,270 13,308
Total Accruing Past Due | Total consumer | Credit cards    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs 3,168 3,436
Total Accruing Past Due | Total consumer | Other consumer loans    
Financing Receivable, Nonaccrual [Line Items]    
Loans, net of deferred fees and costs $ 9,571 $ 10,831