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Significant Estimates and Concentrations of Credit Risks (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Loans Receivable | Geographic Concentration | Alabama Arkansas Florida Texas And New York |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 79.50% |
Residential Real Estate Loans | Geographic Concentration | Alabama Arkansas Florida Texas And New York |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 83.70% |
Commercial Real Estate | Loans Receivable | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 57.60% | 56.70%
Commercial Real Estate | Total Stockholders' Equity | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 214.60% | 215.50%
Residential Real Estate | Loans Receivable | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 16.60% | 15.80%
Residential Real Estate | Total Stockholders' Equity | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 61.90% | 60.10%

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