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Fair Value Accounting - Carrying And Estimated Fair Values Of Financial Instruments Carried On Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Financial assets    
Investment securities held to maturity $ 2,668,068 $ 0
Investment securities available for sale 7,043,681 9,788,662
Loans held for sale 139,323 52,768
Financial liabilities    
Non-interest-bearing deposits 11,655,811 12,507,616
Total deposits 50,195,778 50,739,185
Federal funds purchased and securities sold under repurchase agreements 94,484 189,074
Long-term debt 2,283,767 1,932,534
Level 1    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,294,608 2,451,426
Trading securities 0 0
Investment securities held to maturity 0  
Investment securities available for sale 1,174,295 597,629
Loans held for sale 0 0
Other investments 0 0
Mutual funds and mutual funds held in rabbi trusts 60,356 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 94,484 189,074
Securities sold short 2,536 3,496
Long-term debt 0 0
Mutual funds held in rabbi trusts 45,479 38,735
Derivative liabilities 0 0
Level 2    
Financial assets    
Total cash, cash equivalents, and restricted cash 0 0
Trading securities 13,052 12,898
Investment securities held to maturity 2,638,071  
Investment securities available for sale 5,869,386 9,191,033
Loans held for sale 41,823 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 213,711 184,944
Derivative assets 97,078 94,903
Financial liabilities    
Non-interest-bearing deposits 11,655,811 12,507,616
Non-time interest-bearing deposits 27,278,278 27,449,088
Time deposits 11,235,622 10,769,002
Total deposits 50,169,711 50,725,706
Federal funds purchased and securities sold under repurchase agreements 0 0
Securities sold short 0 0
Long-term debt 2,302,474 1,939,604
Mutual funds held in rabbi trusts 0 0
Derivative liabilities 280,045 259,650
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 97,056 5,432
Other investments 14,423 12,560
Mutual funds and mutual funds held in rabbi trusts 0 0
Loans, net 41,112,625 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 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 2,294,608 2,451,426
Trading securities 13,052 12,898
Investment securities held to maturity 2,668,068  
Investment securities available for sale 7,043,681 9,788,662
Loans held for sale   52,768
Other investments 14,423 12,560
Mutual funds and mutual funds held in rabbi trusts 60,356 53,742
Loans, net 42,608,296 42,925,105
FRB and FHLB stock 213,711 184,944
Derivative assets 97,078 94,903
Financial liabilities    
Non-interest-bearing deposits 11,655,811 12,507,616
Non-time interest-bearing deposits 27,278,278 27,449,088
Time deposits 11,261,689 10,782,481
Total deposits 50,195,778 50,739,185
Federal funds purchased and securities sold under repurchase agreements 94,484 189,074
Securities sold short 2,536 3,496
Long-term debt 2,283,767 1,932,534
Mutual funds held in rabbi trusts 45,479 38,735
Derivative liabilities 280,045 259,650
Fair Value    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,294,608 2,451,426
Trading securities 13,052 12,898
Investment securities held to maturity 2,638,071  
Investment securities available for sale 7,043,681 9,788,662
Loans held for sale 138,879 52,770
Other investments 14,423 12,560
Mutual funds and mutual funds held in rabbi trusts 60,356 53,742
Loans, net 41,112,625 41,298,149
FRB and FHLB stock 213,711 184,944
Derivative assets 97,078 94,903
Financial liabilities    
Non-interest-bearing deposits 11,655,811 12,507,616
Non-time interest-bearing deposits 27,278,278 27,449,088
Time deposits 11,235,622 10,769,002
Total deposits 50,169,711 50,725,706
Federal funds purchased and securities sold under repurchase agreements 94,484 189,074
Securities sold short 2,536 3,496
Long-term debt 2,302,474 1,939,604
Mutual funds held in rabbi trusts 45,479 38,735
Derivative liabilities $ 280,045 $ 259,650