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Debt - Schedule of Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Debt Instrument [Line Items]      
Total Outstanding $ 6,159,595,000   $ 5,520,963,000
Less: unamortized debt issuance costs, premiums and discounts (34,094,000)   (35,081,000)
Total debt 6,125,501,000   5,485,882,000
Debt discounts issued 0    
Debt premium 0    
Amount not available for general borrowing purposes to secure letter of credit 8,600,000   9,100,000
Asset Pledged as Collateral      
Debt Instrument [Line Items]      
Amount not available for general borrowing purposes to secure letter of credit 13,700,000   11,700,000
Personal Loan Securitizations      
Debt Instrument [Line Items]      
Total Collateral 955,674,000    
Total Outstanding 738,588,000   529,132,000
Student loan securitizations      
Debt Instrument [Line Items]      
Total Collateral 210,040,000    
Total Outstanding 231,927,000   246,856,000
Secured Debt | Asset Pledged as Collateral      
Debt Instrument [Line Items]      
Total Capacity 19,000,000    
Unsecured Debt      
Debt Instrument [Line Items]      
Total Capacity $ 5,000,000    
Minimum      
Debt Instrument [Line Items]      
Unused commitment fee percentage 0.00%    
Minimum | Personal Loan Securitizations      
Debt Instrument [Line Items]      
Stated Interest Rate 0.49%    
Minimum | Student loan securitizations      
Debt Instrument [Line Items]      
Stated Interest Rate 1.83%    
Maximum      
Debt Instrument [Line Items]      
Unused commitment fee percentage 0.65%    
Maximum | Personal Loan Securitizations      
Debt Instrument [Line Items]      
Stated Interest Rate 6.21%    
Maximum | Student loan securitizations      
Debt Instrument [Line Items]      
Stated Interest Rate 9.29%    
Personal loan warehouse facilities | Line of Credit      
Debt Instrument [Line Items]      
Total Collateral $ 1,845,226,000    
Total Capacity 4,100,000,000    
Total Outstanding $ 1,539,865,000   1,452,085,000
Personal loan warehouse facilities | Minimum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 5.00%    
Personal loan warehouse facilities | Maximum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 6.71%    
Student loan warehouse facilities | Line of Credit      
Debt Instrument [Line Items]      
Total Collateral $ 2,737,906,000    
Total Capacity 4,180,000,000    
Total Outstanding $ 1,868,019,000   1,504,926,000
Student loan warehouse facilities | Minimum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 5.42%    
Student loan warehouse facilities | Maximum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 6.66%    
Credit card warehouse facility | Line of Credit      
Debt Instrument [Line Items]      
Total Collateral $ 0    
Stated Interest Rate 6.26%    
Total Capacity $ 100,000,000    
Total Outstanding 0   0
Risk retention warehouse facilities | Line of Credit      
Debt Instrument [Line Items]      
Total Collateral 117,157,000    
Total Capacity 200,000,000    
Total Outstanding $ 95,196,000   101,964,000
Risk retention warehouse facilities | Minimum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 6.37%    
Risk retention warehouse facilities | Maximum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 7.19%    
Revolving credit facility | Line of Credit      
Debt Instrument [Line Items]      
Amount not available for general borrowing purposes to secure letter of credit $ 6,000,000    
Revolving credit facility | Revolving credit facility      
Debt Instrument [Line Items]      
Stated Interest Rate 5.86%    
Total Capacity $ 560,000,000    
Total Outstanding $ 486,000,000   486,000,000
Convertible senior notes | Convertible Debt      
Debt Instrument [Line Items]      
Stated Interest Rate 0.00%    
Total Outstanding $ 1,200,000,000   1,200,000,000
Less: unamortized debt issuance costs, premiums and discounts (18,100,000)   (19,400,000)
Interest expense $ 1,272,000 $ 1,267,000  
Effective interest rate 0.11% 0.11%  
Net carrying amount $ 1,180,000,000   1,180,000,000
Other financing | Other Financings      
Debt Instrument [Line Items]      
Total Collateral 28,735,000    
Total Capacity 23,955,000    
Total Outstanding $ 0   $ 0