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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

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