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Commitments and Contingencies - Additional Information (Detail) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Other Commitments [Line Items] |  |
Outstanding loan commitments | $ 384,900,000 | $ 126,000,000.0
Future commitments outstanding related to investments | 9,100,000 |
Performance Stand-by Letters of Credit [Member] |  |
Other Commitments [Line Items] |  |
Outstanding stand-by letters of credit | 655,000 | 0
Financial Stand-by Letters of Credit [Member] |  |
Other Commitments [Line Items] |  |
Outstanding stand-by letters of credit | 3,600,000 | 6,100,000
Other Liabilities [Member] |  |
Other Commitments [Line Items] |  |
Reserves for unfunded commitments to borrowers | $ 512,000 | $ 0

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