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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