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Segment Reporting - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 Segment	Dec. 31, 2019
Segment Reporting Disclosure [Line Items]
Number of business segments	6
Number of operating segments	4
Number of non-operating segments	2
Loan outstanding percent	9.00%
Capital ratios for operating segments	11.9	13.8
Operating Segments [Member]
Segment Reporting Disclosure [Line Items]
Capital ratios for operating segments	20
Swimming Pools [Member]
Segment Reporting Disclosure [Line Items]
Loan outstanding percent	27.00%
Roofs [Member]
Segment Reporting Disclosure [Line Items]
Loan outstanding percent	24.00%
Windows [Member]
Segment Reporting Disclosure [Line Items]
Loan outstanding percent	13.00%
Solar Panels [Member]
Segment Reporting Disclosure [Line Items]
Loan outstanding percent	8.00%
Other Product Lines [Member]
Segment Reporting Disclosure [Line Items]
Loan outstanding percent	8.00%
Texas [Member]
Segment Reporting Disclosure [Line Items]
Loan outstanding percent	15.00%
Florida [Member]
Segment Reporting Disclosure [Line Items]
Loan outstanding percent	9.00%
California [Member]
Segment Reporting Disclosure [Line Items]
Loan outstanding percent	10.00%
Geographic Concentration Risk [Member] | Recreational Vehicles [Member]
Segment Reporting Disclosure [Line Items]
Aggregate percentage of loans lending	60.00%
Geographic Concentration Risk [Member] | Boats [Member]
Segment Reporting Disclosure [Line Items]
Aggregate percentage of loans lending	19.00%
Geographic Concentration Risk [Member] | Trailers [Member]
Segment Reporting Disclosure [Line Items]
Aggregate percentage of loans lending	12.00%
Geographic Concentration Risk [Member] | Midwest [Member]
Segment Reporting Disclosure [Line Items]
Aggregate percentage of loans lending	53.00%
Geographic Concentration Risk [Member] | New York City [Member]
Segment Reporting Disclosure [Line Items]
Aggregate percentage of loans lending	89.00%

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Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

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