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Derivatives - Additional Information (Detail) - Interest Rate Swap [Member] - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Collateral Pledged [Member] |  |
Derivatives Fair Value [Line Items] |  |
Cash and securities at fair value pledged for collateral | $ 7,035 | $ 11,705
Cash and Cash Equivalents [Member] |  |
Derivatives Fair Value [Line Items] |  |
Cash and securities at fair value pledged for collateral | $ 7,000 | $ 11,300

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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