Derivative Instruments and Hedging Activities - Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Interest rate swaps and other contracts
Derivative [Line Items]
Other Assets	$ 0		$ 0
Other Liabilities	729,316		594,476
Interest rate swaps
Derivative [Line Items]
Notional Amount		$ 600,000
Derivatives designated as hedging instruments:
Derivative [Line Items]
Notional Amount	300,000		900,000
Derivatives designated as hedging instruments: | Other Assets
Derivative [Line Items]
Other Assets	0		3,971
Derivatives designated as hedging instruments: | Other Liabilities
Derivative [Line Items]
Other Liabilities	32,361		29,798
Derivatives designated as hedging instruments: | Cash flow hedge interest rate swaps | Interest rate swaps and other contracts
Derivative [Line Items]
Notional Amount	0		600,000
Derivatives designated as hedging instruments: | Cash flow hedge interest rate swaps | Interest rate swaps and other contracts | Other Assets
Derivative [Line Items]
Other Assets	0		3,971
Derivatives designated as hedging instruments: | Cash flow hedge interest rate swaps | Interest rate swaps and other contracts | Other Liabilities
Derivative [Line Items]
Other Liabilities	0		4
Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps
Derivative [Line Items]
Notional Amount	300,000		300,000
Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps | Other Assets
Derivative [Line Items]
Other Assets	0		0
Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps | Other Liabilities
Derivative [Line Items]
Other Liabilities	32,361		29,794
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional Amount	17,324,493		16,058,364
Derivatives not designated as hedging instruments: | Other Assets
Derivative [Line Items]
Other Assets	704,668		463,156
Derivatives not designated as hedging instruments: | Other Liabilities
Derivative [Line Items]
Other Liabilities	702,917		577,439
Derivatives not designated as hedging instruments: | Interest rate swaps
Derivative [Line Items]
Notional Amount	15,926,996		14,753,330
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Assets
Derivative [Line Items]
Other Assets	697,043		449,280
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Liabilities
Derivative [Line Items]
Other Liabilities	696,955		564,678
Derivatives not designated as hedging instruments: | Foreign currency derivatives
Derivative [Line Items]
Notional Amount	1,328,862		1,273,735
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other Assets
Derivative [Line Items]
Other Assets	7,242		13,709
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other Liabilities
Derivative [Line Items]
Other Liabilities	5,658		12,604
Derivatives not designated as hedging instruments: | Mortgage banking derivatives
Derivative [Line Items]
Notional Amount	68,635		31,299
Derivatives not designated as hedging instruments: | Mortgage banking derivatives | Other Assets
Derivative [Line Items]
Other Assets	383		167
Derivatives not designated as hedging instruments: | Mortgage banking derivatives | Other Liabilities
Derivative [Line Items]
Other Liabilities	304		$ 157
Derivatives not designated as hedging instruments: | Fair value hedge interest rate swaps | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 10,400