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Concentration of Credit Risk - Additional Information (Detail) - Financing Receivable - Geographic Concentration Risk	Sep. 30, 2021	Dec. 31, 2020
Florida
Concentration Risk [Line Items]
Concentration risk, Percentage	13.00%	14.00%
Texas
Concentration Risk [Line Items]
Concentration risk, Percentage	13.00%
California
Concentration Risk [Line Items]
Concentration risk, Percentage	10.00%
Illinois
Concentration Risk [Line Items]
Concentration risk, Percentage		13.00%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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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