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Fair Value Accounting - Schedule of Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial assets    
Investment securities held to maturity $ 2,450,885 $ 2,581,469
Investment securities available for sale 7,575,468 7,551,018
Loans held for sale 147,811 90,111
Financial liabilities    
Non-interest-bearing deposits 11,053,423 11,596,119
Total deposits 50,003,729 51,095,359
Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings 62,467 131,728
Long-term debt 3,008,195 1,733,109
Derivatives Not Designated as Hedging Instruments    
Financial liabilities    
Estimated fair value of derivative liabilities 120,958 201,917
Visa derivative | Derivatives Not Designated as Hedging Instruments    
Financial liabilities    
Estimated fair value of derivative liabilities 2,964 64
Level 1    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,274,207 2,993,987
Trading securities 2,004 0
Investment securities held to maturity 0 0
Investment securities available for sale 1,221,154 1,212,742
Loans held for sale 0 0
Other investments 0 0
Mutual funds and mutual funds held in rabbi trusts 72,883 63,371
Loans, net 0 0
FRB and FHLB stock 0 0
Derivative assets 0 0
Financial liabilities    
Non-interest-bearing deposits 0 0
Non-time interest-bearing deposits 0 0
Time deposits 0 0
Total deposits 0 0
Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings 62,467 131,728
Long-term debt 0 0
Mutual funds held in rabbi trusts 57,339 48,351
Derivative liabilities 0 0
Level 2    
Financial assets    
Total cash, cash equivalents, and restricted cash 0 0
Trading securities 19,185 9,713
Investment securities held to maturity 2,466,265 2,524,525
Investment securities available for sale 6,354,314 6,338,276
Loans held for sale 41,083 33,448
Other investments 0 0
Mutual funds and mutual funds held in rabbi trusts 0 0
Loans, net 0 0
FRB and FHLB stock 240,959 164,374
Derivative assets 85,822 83,895
Financial liabilities    
Non-interest-bearing deposits 11,053,423 11,596,119
Non-time interest-bearing deposits 29,949,544 29,883,378
Time deposits 8,977,638 9,587,417
Total deposits 49,980,605 51,066,914
Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings 0 0
Long-term debt 3,051,093 1,748,723
Mutual funds held in rabbi trusts 0 0
Derivative liabilities 117,994 216,325
Level 3    
Financial assets    
Total cash, cash equivalents, and restricted cash 0 0
Trading securities 0 0
Investment securities held to maturity 0 0
Investment securities available for sale 0 0
Loans held for sale 106,372 56,453
Other investments 18,012 14,831
Mutual funds and mutual funds held in rabbi trusts 0 0
Loans, net 42,497,996 41,014,425
FRB and FHLB stock 0 0
Derivative assets 0 0
Financial liabilities    
Non-interest-bearing deposits 0 0
Non-time interest-bearing deposits 0 0
Time deposits 0 0
Total deposits 0 0
Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings 0 0
Long-term debt 0 0
Mutual funds held in rabbi trusts 0 0
Derivative liabilities 0 0
Carrying Value    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,274,207 2,993,987
Trading securities 21,189 9,713
Investment securities held to maturity 2,450,885 2,581,469
Investment securities available for sale 7,575,468 7,551,018
Loans held for sale 147,811 90,111
Other investments 18,012 14,831
Mutual funds and mutual funds held in rabbi trusts 72,883 63,371
Loans, net 43,283,713 42,122,183
FRB and FHLB stock 240,959 164,374
Derivative assets 85,822 83,895
Financial liabilities    
Non-interest-bearing deposits 11,053,423 11,596,119
Non-time interest-bearing deposits 29,949,544 29,883,378
Time deposits 9,000,762 9,615,862
Total deposits 50,003,729 51,095,359
Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings 62,467 131,728
Long-term debt 3,008,195 1,733,109
Mutual funds held in rabbi trusts 57,339 48,351
Derivative liabilities 117,994 216,325
Fair Value    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,274,207 2,993,987
Trading securities 21,189 9,713
Investment securities held to maturity 2,466,265 2,524,525
Investment securities available for sale 7,575,468 7,551,018
Loans held for sale 147,455 89,901
Other investments 18,012 14,831
Mutual funds and mutual funds held in rabbi trusts 72,883 63,371
Loans, net 42,497,996 41,014,425
FRB and FHLB stock 240,959 164,374
Derivative assets 85,822 83,895
Financial liabilities    
Non-interest-bearing deposits 11,053,423 11,596,119
Non-time interest-bearing deposits 29,949,544 29,883,378
Time deposits 8,977,638 9,587,417
Total deposits 49,980,605 51,066,914
Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings 62,467 131,728
Long-term debt 3,051,093 1,748,723
Mutual funds held in rabbi trusts 57,339 48,351
Derivative liabilities $ 117,994 $ 216,325