Derivative Instruments and Hedging Activities - Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional Amount	$ 20,936,738	$ 18,678,243
Other Assets
Derivative [Line Items]
Other Assets	514,661	466,227
Other Liabilities
Derivative [Line Items]
Other Liabilities	531,746	488,103
Derivatives designated as hedging instruments: | Interest rate swaps
Derivative [Line Items]
Notional Amount	404,300
Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps
Derivative [Line Items]
Notional Amount	1,204,296	800,000
Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps | Other Assets
Derivative [Line Items]
Other Assets	3,212	0
Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps | Other Liabilities
Derivative [Line Items]
Other Liabilities	20,982	21,460
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional Amount	19,732,442	17,878,243
Derivatives not designated as hedging instruments: | Other Assets
Derivative [Line Items]
Other Assets	511,449	466,227
Derivatives not designated as hedging instruments: | Other Liabilities
Derivative [Line Items]
Other Liabilities	510,764	466,643
Derivatives not designated as hedging instruments: | Interest rate swaps
Derivative [Line Items]
Notional Amount	16,233,160	16,282,279
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Assets
Derivative [Line Items]
Other Assets	498,938	458,129
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Liabilities
Derivative [Line Items]
Other Liabilities	498,676	457,885
Derivatives not designated as hedging instruments: | Foreign currency derivatives
Derivative [Line Items]
Notional Amount	1,939,866	1,557,167
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other Assets
Derivative [Line Items]
Other Assets	12,466	8,024
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other Liabilities
Derivative [Line Items]
Other Liabilities	11,845	8,286
Derivatives not designated as hedging instruments: | Mortgage banking derivatives
Derivative [Line Items]
Notional Amount	58,378	38,797
Derivatives not designated as hedging instruments: | Mortgage banking derivatives | Other Assets
Derivative [Line Items]
Other Assets	45	74
Derivatives not designated as hedging instruments: | Mortgage banking derivatives | Other Liabilities
Derivative [Line Items]
Other Liabilities	243	472
Derivatives not designated as hedging instruments: | Credit default swap
Derivative [Line Items]
Notional Amount	1,501,038	0
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	0	$ 0
Derivatives not designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 10,400