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Derivative Instruments And Hedging Activities - Narrative (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) position Swap contract	Dec. 31, 2020 USD ($) contract Swap position	Nov. 30, 2020 USD ($) position
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, net liability position, fair value	$ 23,100
Interest Rate Contract
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral pledged	23,348	$ 97,641
Designated as Hedging Instrument | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification, cash flow hedge, after tax	$ 25,900
Not Designated as Hedging Instrument | Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	30 days
Not Designated as Hedging Instrument | Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	60 days
Not Designated as Hedging Instrument | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps | Swap	153	155
Derivative notional amount	$ 1,400,000	$ 1,400,000
Not Designated as Hedging Instrument | Interest rate caps
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps | Swap	14	12
Derivative notional amount	$ 264,700	$ 204,900
Not Designated as Hedging Instrument | Residential mortgage loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	8,200	11,900
Not Designated as Hedging Instrument | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 129,900	$ 177,200
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps | contract	0	5
Derivative notional amount	$ 850,000	$ 1,100,000
Number of contracts terminated | contract	4
Fair Value Hedging | Designated as Hedging Instrument | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps | position	16	24	24
Derivative notional amount	$ 80,500	$ 272,300	$ 272,300
Number of contracts terminated | position	8
Fair Value Hedging | Designated as Hedging Instrument | Terminated Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 191,800

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