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Fair Value Accounting - Carrying And Estimated Fair Values Of Financial Instruments Carried On Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Financial assets    
Investment securities available for sale $ 9,694,515 $ 9,788,662
Loans held for sale 130,586 52,768
Financial liabilities    
Non-interest-bearing deposits 12,042,353 12,507,616
Total deposits 50,580,242 50,739,185
Federal funds purchased and securities sold under repurchase agreements 128,244 189,074
Short-term FHLB advances 252,469 3,496
Long-term debt 2,031,735 1,932,534
Level 1    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,423,500 2,451,426
Trading securities 0 0
Investment securities available for sale 615,409 597,629
Loans held for sale 0 0
Other investments 0 0
Mutual funds and mutual funds held in rabbi trusts 59,649 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 128,244 189,074
Securities sold short 2,469 3,496
Short-term FHLB advances 0  
Long-term debt 0 0
Mutual funds held in rabbi trusts 44,759 38,735
Derivative liabilities 0 0
Level 2    
Financial assets    
Total cash, cash equivalents, and restricted cash 0 0
Trading securities 7,411 12,898
Investment securities available for sale 9,079,106 9,191,033
Loans held for sale 36,698 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 213,713 184,944
Derivative assets 103,589 94,903
Financial liabilities    
Non-interest-bearing deposits 12,042,353 12,507,616
Non-time interest-bearing deposits 27,348,773 27,449,088
Time deposits 11,160,289 10,769,002
Total deposits 50,551,415 50,725,706
Federal funds purchased and securities sold under repurchase agreements 0 0
Securities sold short 0 0
Short-term FHLB advances 250,000  
Long-term debt 2,006,557 1,939,604
Mutual funds held in rabbi trusts 0 0
Derivative liabilities 286,094 259,650
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 93,798 5,432
Other investments 13,115 12,560
Mutual funds and mutual funds held in rabbi trusts 0 0
Loans, net 41,124,811 41,298,149
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 2,423,500 2,451,426
Trading securities 7,411 12,898
Investment securities available for sale 9,694,515 9,788,662
Loans held for sale   52,768
Other investments 13,115 12,560
Mutual funds and mutual funds held in rabbi trusts 59,649 53,742
Loans, net 42,817,216 42,925,105
FRB and FHLB stock 213,713 184,944
Derivative assets 103,589 94,903
Financial liabilities    
Non-interest-bearing deposits 12,042,353 12,507,616
Non-time interest-bearing deposits 27,348,773 27,449,088
Time deposits 11,189,116 10,782,481
Total deposits 50,580,242 50,739,185
Federal funds purchased and securities sold under repurchase agreements 128,244 189,074
Securities sold short 2,469 3,496
Short-term FHLB advances 250,000  
Long-term debt 2,031,735 1,932,534
Mutual funds held in rabbi trusts 44,759 38,735
Derivative liabilities 286,094 259,650
Fair Value    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,423,500 2,451,426
Trading securities 7,411 12,898
Investment securities available for sale 9,694,515 9,788,662
Loans held for sale 130,496 52,770
Other investments 13,115 12,560
Mutual funds and mutual funds held in rabbi trusts 59,649 53,742
Loans, net 41,124,811 41,298,149
FRB and FHLB stock 213,713 184,944
Derivative assets 103,589 94,903
Financial liabilities    
Non-interest-bearing deposits 12,042,353 12,507,616
Non-time interest-bearing deposits 27,348,773 27,449,088
Time deposits 11,160,289 10,769,002
Total deposits 50,551,415 50,725,706
Federal funds purchased and securities sold under repurchase agreements 128,244 189,074
Securities sold short 2,469 3,496
Short-term FHLB advances 250,000  
Long-term debt 2,006,557 1,939,604
Mutual funds held in rabbi trusts 44,759 38,735
Derivative liabilities $ 286,094 $ 259,650