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Significant Estimates and Concentrations of Credit Risks (Detail) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
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 | 56.70% | 56.30%
Loans Receivable | Residential Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 15.80% | 16.10%
Total Stockholders' Equity | Commercial Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 215.50% | 230.10%
Total Stockholders' Equity | Residential Real Estate | Credit Concentration |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 60.10% | 66.00%
Residential Real Estate Loans | Geographic Concentration | Alabama Arkansas Florida Texas And New York |  |
Commitment And Contingencies [Line Items] |  |
Concentration percentage | 84.60% |

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