Derivative Instruments and Hedging Activities - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) derivative swap	Dec. 31, 2019 USD ($) swap derivative
Derivative Instruments, Gain (Loss) [Line Items]
Losses expected to be reclassified from AOCI during the next 12 months	$ 14,600
Length of hedging exposure to variability in future cash flows (months)	73 months
Derivative, net liability position, aggregate fair value	$ 118,500
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	$ 12,500	$ 4,500
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral pledged	$ (117,602)	$ (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) | derivative	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	$ 1,500,000	$ 1,400,000
Number of interest rate swaps (swap) | swap	152	140
Interest Rate Cap | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 77,600	$ 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	$ 172,400	$ 167,100