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Significant Estimates and Concentrations of Credit Risks - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Loans Receivable | Geographic Concentration | South Alabama, Arkansas, Florida and New York City
Commitment And Contingencies [Line Items]
Concentration percentage	79.60%
Loans Receivable | Commercial Real Estate | Credit Concentration
Commitment And Contingencies [Line Items]
Concentration percentage	57.80%	56.70%
Loans Receivable | Residential Real Estate | Credit Concentration
Commitment And Contingencies [Line Items]
Concentration percentage	16.30%	15.80%
Total Stockholders' Equity | Commercial Real Estate | Credit Concentration
Commitment And Contingencies [Line Items]
Concentration percentage	216.50%	215.50%
Total Stockholders' Equity | Residential Real Estate | Credit Concentration
Commitment And Contingencies [Line Items]
Concentration percentage	61.00%	60.10%
Residential Real Estate Loans | Geographic Concentration | South Alabama, Arkansas, Florida and New York City
Commitment And Contingencies [Line Items]
Concentration percentage	83.50%

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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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-Topic 280
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