Derivative Instruments and Hedging Activities - Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Derivative [Line Items]
Notional Amount	$ 20,625,667	$ 19,865,937
Other Assets
Derivative [Line Items]
Other Assets	232,123	444,263
Other Liabilities
Derivative [Line Items]
Other Liabilities	234,175	454,200
Derivatives designated as hedging instruments: | Interest rate swaps
Derivative [Line Items]
Notional Amount	780,322	780,322
Derivatives designated as hedging instruments: | Interest rate swaps | Other Assets
Derivative [Line Items]
Other Assets	6,469	2,419
Derivatives designated as hedging instruments: | Interest rate swaps | Other Liabilities
Derivative [Line Items]
Other Liabilities	8,830	13,993
Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps
Derivative [Line Items]
Notional Amount	780,322	780,322
Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps | Other Assets
Derivative [Line Items]
Other Assets	6,469	2,419
Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps | Other Liabilities
Derivative [Line Items]
Other Liabilities	8,830	13,993
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional Amount	19,845,345	19,085,615
Derivatives not designated as hedging instruments: | Other Assets
Derivative [Line Items]
Other Assets	225,654	441,844
Derivatives not designated as hedging instruments: | Other Liabilities
Derivative [Line Items]
Other Liabilities	225,345	440,207
Derivatives not designated as hedging instruments: | Interest rate swaps
Derivative [Line Items]
Notional Amount	16,982,940	16,209,499
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Assets
Derivative [Line Items]
Other Assets	196,937	423,683
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Liabilities
Derivative [Line Items]
Other Liabilities	196,646	423,492
Derivatives not designated as hedging instruments: | Foreign currency derivatives
Derivative [Line Items]
Notional Amount	1,942,724	1,688,338
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other Assets
Derivative [Line Items]
Other Assets	28,616	18,011
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other Liabilities
Derivative [Line Items]
Other Liabilities	28,445	16,488
Derivatives not designated as hedging instruments: | Mortgage banking derivatives
Derivative [Line Items]
Notional Amount	44,783	45,752
Derivatives not designated as hedging instruments: | Mortgage banking derivatives | Other Assets
Derivative [Line Items]
Other Assets	101	150
Derivatives not designated as hedging instruments: | Mortgage banking derivatives | Other Liabilities
Derivative [Line Items]
Other Liabilities	204	192
Derivatives not designated as hedging instruments: | Credit default swap
Derivative [Line Items]
Notional Amount	874,898	1,142,026	$ 1,500,000
Derivatives not designated as hedging instruments: | Credit default swap | Other Assets
Derivative [Line Items]
Other Assets	0	0
Derivatives not designated as hedging instruments: | Credit default swap | Other Liabilities
Derivative [Line Items]
Other Liabilities	50	$ 35
Derivatives not designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 10,400