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FAIR VALUE MEASUREMENTS - Significant Valuation Inputs (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable securities $ 239,694 $ 163,489    
Loan, Held-for-Sale, Fair Value 389,032 395,922 $ 468,142 $ 255,516
Residual interest securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable securities 38,308 34,506    
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, Fair Value 100,000 88,497    
Loan, Held-for-Sale, Fair Value $ 389,032 $ 369,983    
Level 3 | Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.129 0.129    
Loans Held For Sale, measurement input 0.055 0.076    
Level 3 | CPR        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.135 0.142    
Loans Held For Sale, measurement input 0.131 0.137    
Level 3 | CDR        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.007 0.007    
Loans Held For Sale, measurement input 0.014 0.017    
Level 3 | Servicing Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.003 0.002    
Level 3 | Residual interest securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable securities $ 38,308 $ 34,506    
Level 3 | Residual interest securities | Discount Rate | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, measurement input 0.115 0.145    
Level 3 | Residual interest securities | Discount Rate | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, measurement input 0.246 0.240    
Level 3 | Residual interest securities | Discount Rate | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, measurement input 0.183 0.197    
Level 3 | Residual interest securities | CPR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, measurement input 0.162 0.152    
Level 3 | Residual interest securities | CPR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, measurement input 0.208 0.201    
Level 3 | Residual interest securities | CPR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, measurement input 0.188 0.177    
Level 3 | Residual interest securities | CDR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, measurement input 0 0.015    
Level 3 | Residual interest securities | CDR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, measurement input 0.024 0.017    
Level 3 | Residual interest securities | CDR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, measurement input 0.012 0.016    
Level 3 | HELOC loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, Fair Value $ 98,120 $ 86,465    
Loan, Held-for-Sale, Fair Value $ 323,184 $ 366,154    
Level 3 | HELOC loans | Discount Rate | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.130 0.130    
Loans Held For Sale, measurement input 0.049 0.064    
Level 3 | HELOC loans | Discount Rate | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.130 0.130    
Loans Held For Sale, measurement input 0.089 0.101    
Level 3 | HELOC loans | Discount Rate | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.130 0.130    
Loans Held For Sale, measurement input 0.065 0.076    
Level 3 | HELOC loans | CPR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0 0.010    
Loans Held For Sale, measurement input 0.026 0.013    
Level 3 | HELOC loans | CPR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.325 0.330    
Loans Held For Sale, measurement input 0.396 0.324    
Level 3 | HELOC loans | CPR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.137 0.144    
Loans Held For Sale, measurement input 0.156 0.136    
Level 3 | HELOC loans | CDR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0 0    
Loans Held For Sale, measurement input 0 0.015    
Level 3 | HELOC loans | CDR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.049 0.044    
Loans Held For Sale, measurement input 0.943 0.017    
Level 3 | HELOC loans | CDR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.008 0.007    
Loans Held For Sale, measurement input 0.016 0.016    
Level 3 | HELOC loans | Servicing Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.003 0.002    
Level 3 | HELOC loans | Loss Severity | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0 0.166    
Level 3 | HELOC loans | Loss Severity | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.976 0.442    
Level 3 | HELOC loans | Loss Severity | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.284 0.324    
Level 3 | Mortgage loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, Fair Value $ 1,880 $ 2,032    
Level 3 | Mortgage loans | Discount Rate | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.095 0.100    
Level 3 | Mortgage loans | Discount Rate | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.105 0.110    
Level 3 | Mortgage loans | Discount Rate | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.103 0.108    
Level 3 | Mortgage loans | CPR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.036 0.039    
Level 3 | Mortgage loans | CPR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.080 0.082    
Level 3 | Mortgage loans | CPR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.053 0.057    
Level 3 | Mortgage loans | CDR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0 0    
Level 3 | Mortgage loans | CDR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.011 0.010    
Level 3 | Mortgage loans | CDR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0.004 0.002    
Level 3 | Mortgage loans | Servicing Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Assets, measurement input 0 0    
Level 3 | Personal loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan, Held-for-Sale, Fair Value $ 62,935      
Level 3 | Personal loans | Discount Rate | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.089      
Level 3 | Personal loans | Discount Rate | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.115      
Level 3 | Personal loans | Discount Rate | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.102      
Level 3 | Personal loans | CPR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0      
Level 3 | Personal loans | CPR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0      
Level 3 | Personal loans | CPR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0      
Level 3 | Personal loans | CDR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0      
Level 3 | Personal loans | CDR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0      
Level 3 | Personal loans | CDR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0      
Level 3 | Personal loans | Loss Severity | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0      
Level 3 | Personal loans | Loss Severity | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0      
Level 3 | Personal loans | Loss Severity | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0      
Level 3 | Other        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan, Held-for-Sale, Fair Value $ 2,913 $ 3,829    
Level 3 | Other | Discount Rate | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.062 0.051    
Level 3 | Other | Discount Rate | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.087 0.087    
Level 3 | Other | Discount Rate | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.071 0.069    
Level 3 | Other | CPR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.180 0.179    
Level 3 | Other | CPR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.404 0.997    
Level 3 | Other | CPR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.247 0.256    
Level 3 | Other | CDR | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.013 0.004    
Level 3 | Other | CDR | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.087 0.102    
Level 3 | Other | CDR | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.061 0.077    
Level 3 | Other | Loss Severity | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.880 0.880    
Level 3 | Other | Loss Severity | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.920 0.920    
Level 3 | Other | Loss Severity | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held For Sale, measurement input 0.900 0.900