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Significant Estimates and Concentrations of Credit Risks - Additional Information (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Loans Receivable | Geographic Concentration | South Alabama, Arkansas, Florida and New York City |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 79.60% |
Loans Receivable | Commercial Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 57.80% | 56.70%
Loans Receivable | Residential Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 16.30% | 15.80%
Total Stockholders' Equity | Commercial Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 216.50% | 215.50%
Total Stockholders' Equity | Residential Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 61.00% | 60.10%
Residential Real Estate Loans | Geographic Concentration | South Alabama, Arkansas, Florida and New York City |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 83.50% |

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