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Significant Estimates and Concentrations of Credit Risks (Detail)	12 Months Ended
	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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Commitment And Contingencies [Line Items]

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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