Derivative Instruments and Hedging Activities - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) swap numberOfContracts	Dec. 31, 2019 USD ($) swap numberOfContracts
Derivative Instruments, Gain (Loss) [Line Items]
Losses expected to be reclassified from AOCI during the next 12 months	$ 16,800
Length of hedging exposure to variability in future cash flows (months)	70 months
Derivative, net liability position, aggregate fair value	$ 127,700
Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	30 days
Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative expiration period	60 days
Not Designated as Hedging Instrument | Residential mortgage loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 3,600	$ 4,500
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral pledged	$ 124,561	$ 45,727
Interest Rate Swaps | Derivative Designated as Cash Flow Hedges | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Number of outstanding interest rate derivatives (derivative) | numberOfContracts	5	4
Aggregate notional amount	$ 1,100,000	$ 725,000
Interest Rate Swaps | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 1,600,000	$ 1,400,000
Number of interest rate swaps (swap) | swap	158	140
Interest Rate Cap | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 76,600	$ 78,600
Number of interest rate swaps (swap) | swap	4,000	4,000
Credit Contract | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 171,300	$ 167,100