v3.26.1
Fair Value Measurements - Schedule of Valuation Inputs and Assumptions (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Personal loans    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Aggregate amount committed $ 92,516 $ 0
Student loans    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Aggregate amount committed $ 310,479 $ 437,470
Minimum | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual investments 0.115 0.119
Residual interests classified as debt 0.120 0.120
Minimum | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual investments 0.007 0.007
Residual interests classified as debt 0.011 0.011
Minimum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual investments 0.053 0.051
Residual interests classified as debt 0.095 0.095
Minimum | Loan funding probability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
IRLCs 0.574 0.586
Student loan commitments 0.890 0.890
Personal loan commitments 0.937  
Minimum | Personal loans | Market servicing costs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing rights 0.001 0.001
Minimum | Personal loans | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.178 0.183
Servicing rights 0.147 0.150
Minimum | Personal loans | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.041 0.037
Servicing rights 0.010 0.010
Minimum | Personal loans | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.046 0.044
Servicing rights 0.085 0.085
Minimum | Student loans | Market servicing costs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing rights 0.001 0.001
Minimum | Student loans | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.097 0.096
Servicing rights 0.078 0.064
Minimum | Student loans | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.003 0.004
Servicing rights 0.003 0.003
Minimum | Student loans | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.038 0.037
Servicing rights 0.085 0.085
Minimum | Home loans | Market servicing costs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing rights 0.007 0.001
Minimum | Home loans | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.060 0.062
Servicing rights 0.045 0.047
Minimum | Home loans | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.001 0.001
Servicing rights 0.001 0.000
Minimum | Home loans | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.051 0.049
Servicing rights 0.092 0.093
Maximum | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual investments 0.356 0.365
Residual interests classified as debt 0.120 0.120
Maximum | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual investments 0.087 0.086
Residual interests classified as debt 0.011 0.011
Maximum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual investments 0.300 0.300
Residual interests classified as debt 0.095 0.095
Maximum | Loan funding probability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
IRLCs 0.853 0.756
Student loan commitments 0.990 0.990
Personal loan commitments 0.994  
Maximum | Personal loans | Market servicing costs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing rights 0.012 0.011
Maximum | Personal loans | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.295 0.307
Servicing rights 0.356 0.394
Maximum | Personal loans | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.167 0.379
Servicing rights 0.210 0.180
Maximum | Personal loans | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.067 0.066
Servicing rights 0.192 0.190
Maximum | Student loans | Market servicing costs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing rights 0.003 0.003
Maximum | Student loans | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.126 0.129
Servicing rights 0.156 0.151
Maximum | Student loans | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.067 0.064
Servicing rights 0.138 0.037
Maximum | Student loans | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.082 0.082
Servicing rights 0.085 0.085
Maximum | Home loans | Market servicing costs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing rights 0.009 0.002
Maximum | Home loans | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.236 0.207
Servicing rights 0.147 0.215
Maximum | Home loans | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.074 0.074
Servicing rights 0.004 0.001
Maximum | Home loans | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.085 0.085
Servicing rights 0.130 0.100
Weighted Average | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual investments 0.221 0.212
Residual interests classified as debt 0.120 0.120
Weighted Average | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual investments 0.039 0.035
Residual interests classified as debt 0.011 0.011
Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual investments 0.135 0.119
Residual interests classified as debt 0.095 0.095
Weighted Average | Loan funding probability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
IRLCs 0.747 0.697
Student loan commitments 0.935 0.945
Personal loan commitments 0.952  
Weighted Average | Personal loans | Market servicing costs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing rights 0.003 0.003
Weighted Average | Personal loans | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.255 0.269
Servicing rights 0.254 0.243
Weighted Average | Personal loans | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.046 0.045
Servicing rights 0.050 0.050
Weighted Average | Personal loans | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.046 0.045
Servicing rights 0.103 0.101
Weighted Average | Student loans | Market servicing costs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing rights 0.002 0.002
Weighted Average | Student loans | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.111 0.112
Servicing rights 0.129 0.125
Weighted Average | Student loans | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.007 0.007
Servicing rights 0.009 0.009
Weighted Average | Student loans | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.040 0.039
Servicing rights 0.085 0.085
Weighted Average | Home loans | Market servicing costs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing rights 0.007 0.001
Weighted Average | Home loans | Conditional prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.142 0.136
Servicing rights 0.088 0.087
Weighted Average | Home loans | Annual default rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.005 0.006
Servicing rights 0.001 0.000
Weighted Average | Home loans | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.060 0.059
Servicing rights 0.093 0.093