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Derivatives - Summary of Interest Rate Swap Transactions (Detail) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Net Exposure, Notional Amount | $ 0 | $ 0
Net Exposure, Fair value | 0 | (64,000)
Derivative Financial Instruments, Assets [Member] | Swap Assets [Member] |  |
Derivatives Fair Value [Line Items] |  |
Net Exposure, Notional Amount | 239,230,000 | 244,748,000
Net Exposure, Fair value | 12,858,000 | 21,700,000
Derivative Financial Instruments, Liabilities [Member] | Swap Liabilities [Member] |  |
Derivatives Fair Value [Line Items] |  |
Net Exposure, Notional Amount | (239,230,000) | (244,748,000)
Net Exposure, Fair value | $ (12,858,000) | $ (21,764,000)

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