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Fair Value Accounting (Schedule of Carrying and Estimated Fair Values of Financial Instruments Carried on Balance Sheet) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financial assets |  |
Investment securities available for sale | $ 9,237,191 | $ 9,678,103
Loans held for sale | 66,558 | 391,502
Financial liabilities |  |
Non-interest-bearing deposits | 12,976,574 | 15,639,899
Total deposits | 50,203,890 | 48,871,559
Federal funds purchased and securities sold under repurchase agreements | 98,270 | 146,588
Long-term debt | 2,704,701 | 4,109,597
Level 1 |  |
Financial assets |  |
Total cash, cash equivalents, and restricted cash | 2,137,631 | 1,977,780
Trading securities | 0 | 0
Investment securities available for sale | 509,460 | 471,813
Loans held for sale | 0 | 0
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 49,119 | 42,659
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 | 98,270 | 146,588
Securities sold short | 2,362 | 3,370
Short-term FHLB advances |  | 0
Long-term debt | 0 | 0
Mutual funds held in rabbi trusts | 34,768 | 27,944
Derivative liabilities | 0 | 0
Level 2 |  |
Financial assets |  |
Total cash, cash equivalents, and restricted cash | 0 | 0
Trading securities | 13,555 | 8,295
Investment securities available for sale | 8,727,731 | 9,206,290
Loans held for sale | 48,994 | 51,136
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
Loans, net | 0 | 0
FRB and FHLB stock | 228,816 | 308,321
Derivative assets | 161,163 | 89,815
Financial liabilities |  |
Non-interest-bearing deposits | 12,976,574 | 15,639,899
Non-time interest-bearing deposits | 26,703,913 | 26,936,635
Time deposits | 10,465,194 | 6,260,315
Total deposits | 50,145,681 | 48,836,849
Federal funds purchased and securities sold under repurchase agreements | 0 | 0
Securities sold short | 0 | 0
Short-term FHLB advances |  | 600,014
Long-term debt | 2,632,267 | 4,120,113
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 387,118 | 339,227
Level 3 |  |
Financial assets |  |
Total cash, cash equivalents, and restricted cash | 0 | 0
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Loans held for sale | 17,584 | 339,949
Other investments | 11,789 | 11,172
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
Loans, net | 41,289,287 | 42,192,295
FRB and FHLB stock |  | 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 | 0
Short-term FHLB advances |  | 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 | 2,137,631 | 1,977,780
Trading securities | 13,555 | 8,295
Investment securities available for sale | 9,237,191 | 9,678,103
Loans held for sale |  | 391,502
Other investments | 11,789 | 11,172
Mutual funds and mutual funds held in rabbi trusts | 49,119 | 42,659
Loans, net | 43,202,378 | 43,272,929
FRB and FHLB stock | 228,816 | 308,321
Derivative assets | 161,163 | 89,815
Financial liabilities |  |
Non-interest-bearing deposits | 12,976,574 | 15,639,899
Non-time interest-bearing deposits | 26,703,913 | 26,936,635
Time deposits | 10,523,403 | 6,295,025
Total deposits | 50,203,890 | 48,871,559
Federal funds purchased and securities sold under repurchase agreements | 98,270 | 146,588
Securities sold short | 2,362 | 3,370
Short-term FHLB advances |  | 600,014
Long-term debt | 2,704,701 | 4,109,597
Mutual funds held in rabbi trusts | 34,768 | 27,944
Derivative liabilities | 387,118 | 339,227
Fair Value |  |
Financial assets |  |
Total cash, cash equivalents, and restricted cash | 2,137,631 | 1,977,780
Trading securities | 13,555 | 8,295
Investment securities available for sale | 9,237,191 | 9,678,103
Loans held for sale | 66,578 | 391,085
Other investments | 11,789 | 11,172
Mutual funds and mutual funds held in rabbi trusts | 49,119 | 42,659
Loans, net | 41,289,287 | 42,192,295
FRB and FHLB stock | 228,816 | 308,321
Derivative assets | 161,163 | 89,815
Financial liabilities |  |
Non-interest-bearing deposits | 12,976,574 | 15,639,899
Non-time interest-bearing deposits | 26,703,913 | 26,936,635
Time deposits | 10,465,194 | 6,260,315
Total deposits | 50,145,681 | 48,836,849
Federal funds purchased and securities sold under repurchase agreements | 98,270 | 146,588
Securities sold short | 2,362 | 3,370
Short-term FHLB advances |  | 600,014
Long-term debt | 2,632,267 | 4,120,113
Mutual funds held in rabbi trusts | 34,768 | 27,944
Derivative liabilities | $ 387,118 | $ 339,227

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