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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