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Debt (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2015
Debt Instrument [Line Items]      
Payable to Structured Program note and certificate holders [1] $ 152,808,000 $ 40,610,000  
Assets Sold under Repurchase Agreements      
Debt Instrument [Line Items]      
Securities pledged as collateral 133,500,000 174,800,000  
Securities Sold under Repurchase Agreements      
Debt Instrument [Line Items]      
Debt outstanding under Repurchase Agreements 105,000,000.0 140,200,000  
Variable Interest Entity, Primary Beneficiary      
Debt Instrument [Line Items]      
Payable to Structured Program note and certificate holders $ 152,808,000 40,610,000  
Minimum      
Debt Instrument [Line Items]      
Weighted-average estimated life of repurchase agreements 10 months 24 days    
Maximum      
Debt Instrument [Line Items]      
Weighted-average estimated life of repurchase agreements 1 year 4 months 24 days    
Loans Held for Investment | Variable Interest Entity, Primary Beneficiary | Loans Related to Consolidation of Securitization Trust | Payable to Securitization Note and Certificate Holders      
Debt Instrument [Line Items]      
Payable to Structured Program note and certificate holders $ 152,800,000 40,600,000  
Personal Loan and Auto Loan Warehouse Credit Facilities | Loans Held for Sale      
Debt Instrument [Line Items]      
Loans pledged as collateral   $ 551,500,000  
Securities Sold Under Repurchase Agreements | London Interbank Offered Rate (LIBOR) | Minimum      
Debt Instrument [Line Items]      
Basis spread 3.05% 3.41%  
Securities Sold Under Repurchase Agreements | London Interbank Offered Rate (LIBOR) | Maximum      
Debt Instrument [Line Items]      
Basis spread 4.00% 4.40%  
Payables to Securitization Holders      
Debt Instrument [Line Items]      
Restricted cash pledged as collateral $ 13,500,000 $ 2,900,000  
Payables to Securitization Holders | Loans Held for Investment | Variable Interest Entity, Primary Beneficiary | Loans Related to Consolidation of Securitization Trust      
Debt Instrument [Line Items]      
Loans pledged as collateral $ 148,300,000    
Payables to Securitization Holders | Loans Held for Investment and Loans Held for Sale      
Debt Instrument [Line Items]      
Loans pledged as collateral   40,300,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Outstanding principal   60,000,000.0  
Current borrowing capacity     $ 120,000,000.0
Revolving Credit Facility | Minimum      
Debt Instrument [Line Items]      
Commitment fee 0.25%    
Revolving Credit Facility | Maximum      
Debt Instrument [Line Items]      
Commitment fee 0.375%    
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis spread 4.46%    
Revolving Credit Facility | Personal Loan and Auto Loan Warehouse Credit Facilities      
Debt Instrument [Line Items]      
Outstanding principal   387,300,000  
Restricted cash pledged as collateral   $ 25,100,000  
Revolving Credit Facility | Personal Loan and Auto Loan Warehouse Credit Facilities | London Interbank Offered Rate (LIBOR) | Minimum      
Debt Instrument [Line Items]      
Basis spread 3.76%    
Revolving Credit Facility | Personal Loan and Auto Loan Warehouse Credit Facilities | London Interbank Offered Rate (LIBOR) | Maximum      
Debt Instrument [Line Items]      
Basis spread 4.42%    
Revolving Credit Facility | Personal Loan Warehouse Credit Facilities | Minimum      
Debt Instrument [Line Items]      
Monthly unused commitment fee (percent) 0.375%    
Revolving Credit Facility | Personal Loan Warehouse Credit Facilities | Maximum      
Debt Instrument [Line Items]      
Monthly unused commitment fee (percent) 1.25%    
[1] Includes amounts in consolidated variable interest entities (VIEs) presented separately in the table below.