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Segment Reporting - Additional Information (Detail)
9 Months Ended
Sep. 30, 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  
Capital ratios for operating segments 10.8 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 28.00%  
Roofs [Member]    
Segment Reporting Disclosure [Line Items]    
Loan outstanding percent 24.00%  
Windows [Member]    
Segment Reporting Disclosure [Line Items]    
Loan outstanding percent 12.00%  
Solar Panels [Member]    
Segment Reporting Disclosure [Line Items]    
Loan outstanding percent 9.00%  
Texas [Member]    
Segment Reporting Disclosure [Line Items]    
Loan outstanding percent 16.00%  
Florida [Member]    
Segment Reporting Disclosure [Line Items]    
Loan outstanding percent 10.00%  
California [Member]    
Segment Reporting Disclosure [Line Items]    
Loan outstanding percent 9.00%  
Geographic Concentration Risk [Member] | Recreational Vehicles [Member]    
Segment Reporting Disclosure [Line Items]    
Aggregate percentage of loans lending 61.00%  
Geographic Concentration Risk [Member] | Boats [Member]    
Segment Reporting Disclosure [Line Items]    
Aggregate percentage of loans lending 20.00%  
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 54.00%  
Geographic Concentration Risk [Member] | New York City [Member]    
Segment Reporting Disclosure [Line Items]    
Aggregate percentage of loans lending 90.00%