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Fair Value Accounting - Schedule of Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets |  |
Investment securities held to maturity | $ 2,622,457 | $ 0
Investment securities available for sale | 7,554,168 | 9,788,662
Loans held for sale | 121,470 | 52,768
Financial liabilities |  |
Non-interest-bearing deposits | 11,561,626 | 12,507,616
Total deposits | 50,193,740 | 50,739,185
Federal funds purchased and securities sold under repurchase agreements | 94,055 | 189,074
Long-term debt | 2,021,050 | 1,932,534
Level 1 |  |
Financial assets |  |
Total cash, cash equivalents, and restricted cash | 1,853,612 | 2,451,426
Trading securities | 154 | 0
Investment securities held to maturity | 0 |
Investment securities available for sale | 1,214,363 | 597,629
Loans held for sale | 0 | 0
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 62,901 | 53,742
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 | 94,055 | 189,074
Securities sold short |  | 3,496
Long-term debt | 0 | 0
Mutual funds held in rabbi trusts | 47,484 | 38,735
Derivative liabilities | 0 | 0
Level 2 |  |
Financial assets |  |
Total cash, cash equivalents, and restricted cash | 0 | 0
Trading securities | 13,719 | 12,898
Investment securities held to maturity | 2,727,898 |
Investment securities available for sale | 6,339,805 | 9,191,033
Loans held for sale | 36,943 | 47,338
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
Loans, net | 0 | 0
FRB and FHLB stock | 200,873 | 184,944
Derivative assets | 84,673 | 94,903
Financial liabilities |  |
Non-interest-bearing deposits | 11,561,626 | 12,507,616
Non-time interest-bearing deposits | 28,103,562 | 27,449,088
Time deposits | 10,535,667 | 10,769,002
Total deposits | 50,200,855 | 50,725,706
Federal funds purchased and securities sold under repurchase agreements | 0 | 0
Securities sold short |  | 0
Long-term debt | 2,032,273 | 1,939,604
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 175,413 | 259,650
Level 3 |  |
Financial assets |  |
Total cash, cash equivalents, and restricted cash | 0 | 0
Trading securities | 0 | 0
Investment securities held to maturity | 0 |
Investment securities available for sale | 0 | 0
Loans held for sale | 84,312 | 5,432
Other investments | 14,711 | 12,560
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
Loans, net | 41,803,142 | 41,298,149
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
Securities sold short |  | 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 | 1,853,612 | 2,451,426
Trading securities | 13,873 | 12,898
Investment securities held to maturity | 2,622,457 |
Investment securities available for sale | 7,554,168 | 9,788,662
Loans held for sale |  | 52,768
Other investments | 14,711 | 12,560
Mutual funds and mutual funds held in rabbi trusts | 62,901 | 53,742
Loans, net | 42,635,689 | 42,925,105
FRB and FHLB stock | 200,873 | 184,944
Derivative assets | 84,673 | 94,903
Financial liabilities |  |
Non-interest-bearing deposits | 11,561,626 | 12,507,616
Non-time interest-bearing deposits | 28,103,562 | 27,449,088
Time deposits | 10,528,552 | 10,782,481
Total deposits | 50,193,740 | 50,739,185
Federal funds purchased and securities sold under repurchase agreements | 94,055 | 189,074
Securities sold short |  | 3,496
Long-term debt | 2,021,050 | 1,932,534
Mutual funds held in rabbi trusts | 47,484 | 38,735
Derivative liabilities | 175,413 | 259,650
Fair Value |  |
Financial assets |  |
Total cash, cash equivalents, and restricted cash | 1,853,612 | 2,451,426
Trading securities | 13,873 | 12,898
Investment securities held to maturity | 2,727,898 |
Investment securities available for sale | 7,554,168 | 9,788,662
Loans held for sale | 121,255 | 52,770
Other investments | 14,711 | 12,560
Mutual funds and mutual funds held in rabbi trusts | 62,901 | 53,742
Loans, net | 41,803,142 | 41,298,149
FRB and FHLB stock | 200,873 | 184,944
Derivative assets | 84,673 | 94,903
Financial liabilities |  |
Non-interest-bearing deposits | 11,561,626 | 12,507,616
Non-time interest-bearing deposits | 28,103,562 | 27,449,088
Time deposits | 10,535,667 | 10,769,002
Total deposits | 50,200,855 | 50,725,706
Federal funds purchased and securities sold under repurchase agreements | 94,055 | 189,074
Securities sold short |  | 3,496
Long-term debt | 2,032,273 | 1,939,604
Mutual funds held in rabbi trusts | 47,484 | 38,735
Derivative liabilities | $ 175,413 | $ 259,650

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