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Significant Estimates and Concentrations of Credit Risks (Detail)	12 Months Ended
	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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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.

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