Derivative Instruments and Hedging Activities - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) swap	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) swap	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	$ 17,274,718		$ 17,274,718		$ 16,058,364
Interest rate swaps
Derivative [Line Items]
Number of instruments held | swap	6		6
Notional amount	$ 600,000		$ 600,000
Income (loss) in other comprehensive income before tax			3,600
Accumulated net after-tax gains related to effective cash flow hedges	2,400		2,400		2,200
Interest rate swaps | Interest income
Derivative [Line Items]
Amounts reclassified to income statement	1,200		1,200
Interest rate swaps | Interest expense
Derivative [Line Items]
Amounts reclassified to income statement	238		238
Interest rate swaps | Fair value hedge interest rate swaps | Noninterest Income
Derivative [Line Items]
Fee income related to derivative interest rate swaps executed with commercial loan customers	14,100	$ 13,200	24,000	$ 27,600
Interest rate swaps | Fair value hedge interest rate swaps | Interest expense
Derivative [Line Items]
Fee income related to derivative interest rate swaps executed with commercial loan customers	$ (3,790)	$ 76	$ 902	$ 606
Interest rate swaps | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Number of instruments held | swap	36		36
Notional amount	$ 15,837,195		$ 15,837,195		$ 14,753,330
Interest rate swaps | Derivatives not designated as hedging instruments: | Fair value hedge interest rate swaps
Derivative [Line Items]
Number of instruments held | swap	2		2
Notional amount	$ 10,400		$ 10,400
Interest rate swaps | Derivatives not designated as hedging instruments: | Risk Participation Agreement
Derivative [Line Items]
Notional amount	$ 492,800		$ 492,800