Commitments and Contingencies - Amounts Related to Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2021
Derivative [Line Items]
Notional Amount	$ 19,865,937		$ 18,678,243
Derivative—interest rate swaps:
Derivative [Line Items]
Notional Amount				$ 300,000
Derivatives designated as hedging instruments:
Derivative [Line Items]
Notional Amount	780,322		800,000
Derivatives designated as hedging instruments: | Derivative—interest rate swaps:
Derivative [Line Items]
Notional Amount	480,300
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional Amount	19,085,615		17,878,243
Derivatives not designated as hedging instruments: | Derivative—interest rate swaps:
Derivative [Line Items]
Notional Amount	16,209,499		16,282,279
Derivatives not designated as hedging instruments: | Foreign currency derivatives
Derivative [Line Items]
Notional Amount	1,688,338		1,557,167
Derivatives not designated as hedging instruments: | Mortgage banking derivatives
Derivative [Line Items]
Notional Amount	45,752		38,797
Derivatives not designated as hedging instruments: | Credit Default Swap
Derivative [Line Items]
Notional Amount	1,142,026	$ 1,500,000	0
Other Assets
Derivative [Line Items]
Other Assets	444,263		466,227
Other Assets | Derivatives designated as hedging instruments:
Derivative [Line Items]
Other Assets	2,419		0
Other Assets | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Other Assets	441,844		466,227
Other Assets | Derivatives not designated as hedging instruments: | Derivative—interest rate swaps:
Derivative [Line Items]
Other Assets	423,683		458,129
Other Assets | Derivatives not designated as hedging instruments: | Foreign currency derivatives
Derivative [Line Items]
Other Assets	18,011		8,024
Other Assets | Derivatives not designated as hedging instruments: | Mortgage banking derivatives
Derivative [Line Items]
Other Assets	150		74
Other Assets | Derivatives not designated as hedging instruments: | Credit Default Swap
Derivative [Line Items]
Other Assets	0		0
Other Liabilities
Derivative [Line Items]
Other Liabilities	454,200		488,103
Other Liabilities | Derivatives designated as hedging instruments:
Derivative [Line Items]
Other Liabilities	13,993		21,460
Other Liabilities | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Other Liabilities	440,207		466,643
Other Liabilities | Derivatives not designated as hedging instruments: | Derivative—interest rate swaps:
Derivative [Line Items]
Other Liabilities	423,492		457,885
Other Liabilities | Derivatives not designated as hedging instruments: | Foreign currency derivatives
Derivative [Line Items]
Other Liabilities	16,488		8,286
Other Liabilities | Derivatives not designated as hedging instruments: | Mortgage banking derivatives
Derivative [Line Items]
Other Liabilities	192		472
Other Liabilities | Derivatives not designated as hedging instruments: | Credit Default Swap
Derivative [Line Items]
Other Liabilities	35		0
Fair value hedge interest rate swaps | Derivatives designated as hedging instruments: | Derivative—interest rate swaps:
Derivative [Line Items]
Notional Amount	780,322		800,000
Fair value hedge interest rate swaps | Derivatives not designated as hedging instruments: | Derivative—interest rate swaps:
Derivative [Line Items]
Notional Amount	10,400
Fair value hedge interest rate swaps | Other Assets | Derivatives designated as hedging instruments: | Derivative—interest rate swaps:
Derivative [Line Items]
Other Assets	2,419		0
Fair value hedge interest rate swaps | Other Liabilities | Derivatives designated as hedging instruments: | Derivative—interest rate swaps:
Derivative [Line Items]
Other Liabilities	$ 13,993		$ 21,460