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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Designated as Hedging Instrument | Other assets
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets		$ 0
Designated as Hedging Instrument | Other assets | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	$ 196
Designated as Hedging Instrument | Other assets | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	0
Designated as Hedging Instrument | Other assets | Interest rate swaps | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	196	0
Designated as Hedging Instrument | Other assets | Interest rate swaps | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	0
Designated as Hedging Instrument | Other liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities		21,374
Designated as Hedging Instrument | Other liabilities | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	40,765
Designated as Hedging Instrument | Other liabilities | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	741
Designated as Hedging Instrument | Other liabilities | Interest rate swaps | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	40,765	21,374
Designated as Hedging Instrument | Other liabilities | Interest rate swaps | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	741
Not Designated as Hedging Instrument | Other assets
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	54,027	23,608
Not Designated as Hedging Instrument | Other assets | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	53,455	23,301
Not Designated as Hedging Instrument | Other assets | Interest rate caps
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	46	9
Not Designated as Hedging Instrument | Other assets | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	326	219
Not Designated as Hedging Instrument | Other assets | Residential mortgage loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative assets	200	79
Not Designated as Hedging Instrument | Other liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	56,658	24,565
Not Designated as Hedging Instrument | Other liabilities | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	56,209	24,797
Not Designated as Hedging Instrument | Other liabilities | Interest rate caps
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	46	9
Not Designated as Hedging Instrument | Other liabilities | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	403	(241)
Not Designated as Hedging Instrument | Other liabilities | Residential mortgage loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, derivative liabilities	$ 0	$ 0

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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No definition available.

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