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Significant Estimates and Concentrations of Credit Risks - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Loans Receivable | Geographic Concentration | Alabama Arkansas Florida Texas And New York |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 79.80% |
Loans Receivable | Commercial Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 56.40% | 57.60%
Loans Receivable | Residential Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 18.20% | 16.60%
Total Stockholders' Equity | Commercial Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 209.60% | 214.60%
Total Stockholders' Equity | Residential Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 67.50% | 61.90%
Residential Real Estate Loans | Geographic Concentration | Alabama Arkansas Florida Texas And New York |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 83.60% |

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