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Fair Value Accounting - Schedule of Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Financial assets    
Investment securities held to maturity $ 2,409,184 $ 2,581,469
Investment securities available for sale 7,411,072 7,551,018
Loans held for sale 106,221 90,111
Mutual funds and mutual funds held in rabbi trusts 74,992 63,371
Derivative assets 83,960 83,895
Financial liabilities    
Non-interest-bearing deposits 11,201,939 11,596,119
Time deposits 9,206,308  
Total deposits 51,323,922 51,095,359
Long-term debt 2,456,442 1,733,109
Derivatives Not Designated as Hedging Instruments    
Financial liabilities    
Estimated fair value of derivative liabilities 113,150 201,917
Visa Derivative Liability | Derivatives Not Designated as Hedging Instruments    
Financial liabilities    
Estimated fair value of derivative liabilities 2,940 64
Fair Value, Measurements, Recurring    
Financial assets    
Trading securities 15,401 9,713
Investment securities available for sale 7,411,072 7,551,018
Other investments 17,980 14,831
Mutual funds and mutual funds held in rabbi trusts 74,992 63,371
Derivative assets 83,960 83,895
Financial liabilities    
Mutual fund held in rabbi trusts 59,345 48,351
Derivative liabilities 110,210 216,325
Level 1 | Fair Value, Measurements, Recurring    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,537,705 2,993,987
Trading securities 3,011 0
Investment securities held to maturity 0 0
Investment securities available for sale 1,195,107 1,212,742
Loans held for sale 0 0
Other investments 0 0
Mutual funds and mutual funds held in rabbi trusts 74,992 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 and securities sold under repurchase agreements 48,848 131,728
Long-term debt 0 0
Mutual fund held in rabbi trusts 59,345 48,351
Derivative liabilities 0 0
Level 2 | Fair Value, Measurements, Recurring    
Financial assets    
Total cash, cash equivalents, and restricted cash 0 0
Trading securities 12,390 9,713
Investment securities held to maturity 2,419,349 2,524,525
Investment securities available for sale 6,215,965 6,338,276
Loans held for sale 36,593 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 200,786 164,374
Derivative assets 83,960 83,895
Financial liabilities    
Non-interest-bearing deposits 11,201,939 11,596,119
Non-time interest-bearing deposits 30,915,675 29,883,378
Time deposits 9,192,320 9,587,417
Total deposits 51,309,934 51,066,914
Federal funds purchased and securities sold under repurchase agreements 0 0
Long-term debt 2,501,434 1,748,723
Mutual fund held in rabbi trusts 0 0
Derivative liabilities 110,210 216,325
Level 3 | Fair Value, Measurements, Recurring    
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 69,429 56,453
Other investments 17,980 14,831
Mutual funds and mutual funds held in rabbi trusts 0 0
Loans, net 43,306,294 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 and securities sold under repurchase agreements 0 0
Long-term debt 0 0
Mutual fund held in rabbi trusts 0 0
Derivative liabilities 0 0
Carrying Value | Fair Value, Measurements, Recurring    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,537,705 2,993,987
Trading securities 15,401 9,713
Investment securities held to maturity 2,409,184 2,581,469
Investment securities available for sale 7,411,072 7,551,018
Loans held for sale 106,221 90,111
Other investments 17,980 14,831
Mutual funds and mutual funds held in rabbi trusts 74,992 63,371
Loans, net 44,147,693 42,122,183
FRB and FHLB stock 200,786 164,374
Derivative assets 83,960 83,895
Financial liabilities    
Non-interest-bearing deposits 11,201,939 11,596,119
Non-time interest-bearing deposits 30,915,675 29,883,378
Time deposits 9,206,308 9,615,862
Total deposits 51,323,922 51,095,359
Federal funds purchased and securities sold under repurchase agreements 48,848 131,728
Long-term debt 2,456,442 1,733,109
Mutual fund held in rabbi trusts 59,345 48,351
Derivative liabilities 110,210 216,325
Fair Value | Fair Value, Measurements, Recurring    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,537,705 2,993,987
Trading securities 15,401 9,713
Investment securities held to maturity 2,419,349 2,524,525
Investment securities available for sale 7,411,072 7,551,018
Loans held for sale 106,022 89,901
Other investments 17,980 14,831
Mutual funds and mutual funds held in rabbi trusts 74,992 63,371
Loans, net 43,306,294 41,014,425
FRB and FHLB stock 200,786 164,374
Derivative assets 83,960 83,895
Financial liabilities    
Non-interest-bearing deposits 11,201,939 11,596,119
Non-time interest-bearing deposits 30,915,675 29,883,378
Time deposits 9,192,320 9,587,417
Total deposits 51,309,934 51,066,914
Federal funds purchased and securities sold under repurchase agreements 48,848 131,728
Long-term debt 2,501,434 1,748,723
Mutual fund held in rabbi trusts 59,345 48,351
Derivative liabilities $ 110,210 $ 216,325