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Derivatives - Summary of Interest Rate Swap Transactions (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Net Exposure, Notional Amount	$ 0	$ 0
Net Exposure, Fair value	(44,000)	(64,000)
Derivative Financial Instruments, Assets [Member] | Swap Assets [Member]
Derivatives Fair Value [Line Items]
Net Exposure, Notional Amount	243,438,000	244,748,000
Net Exposure, Fair value	12,609,000	21,700,000
Derivative Financial Instruments, Liabilities [Member] | Swap Liabilities [Member]
Derivatives Fair Value [Line Items]
Net Exposure, Notional Amount	(243,438,000)	(244,748,000)
Net Exposure, Fair value	$ (12,653,000)	$ (21,764,000)

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Fair value adjustments to swap assets.

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Fair value of liability associated with 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.

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Nominal or face amount used to calculate payments on the derivative asset.

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