v3.26.1
FAIR VALUE OF ASSETS AND LIABILITIES - Schedule Credit Card Derivative Asset (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Servicing Assets And Liabilities Fair Value [Line Items]    
Fair value, using the following assumptions: $ 48,290 $ 38,739
Servicing rate increase 0.025%  
Servicing rate decrease 0.025%  
Prepayment rate increase 110.00%  
Prepayment rate decrease 90.00%  
Default rate increase 110.00%  
Default rate decrease 90.00%  
Prepayment rate assumption    
Servicing Assets And Liabilities Fair Value [Line Items]    
Prepayment rate increase 110.00%  
Prepayment rate decrease 90.00%  
Default rate assumption    
Servicing Assets And Liabilities Fair Value [Line Items]    
Default rate increase 110.00%  
Default rate decrease 90.00%  
Credit Card Derivative (Note 5)    
Servicing Assets And Liabilities Fair Value [Line Items]    
Outstanding Credit Card Principal Balance, Prosper and Coastal Allocations $ 330,409 $ 303,245
Credit Card Derivative (Note 5) | Discount rate on Prosper Allocations    
Servicing Assets And Liabilities Fair Value [Line Items]    
Valuation techniques 0.2315 0.2244
Credit Card Derivative (Note 5) | Discount rate on Coastal Program Fee    
Servicing Assets And Liabilities Fair Value [Line Items]    
Valuation techniques 0.2315 0.2244
Credit Card Derivative (Note 5) | Prepayment rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Valuation techniques 0.0822 0.0814
Credit Card Derivative (Note 5) | Prepayment rate | Applying a 1.1 multiplier to prepayment rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Expected fair value with change in assumptions $ 47,625 $ 38,210
Credit Card Derivative (Note 5) | Prepayment rate | Applying a 0.9 multiplier to prepayment rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Expected fair value with change in assumptions $ 48,964 $ 39,275
Credit Card Derivative (Note 5) | Default rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Valuation techniques 0.1533 0.1565
Credit Card Derivative (Note 5) | Default rate | Applying a 1.1 multiplier to default rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Expected fair value with change in assumptions $ 38,254 $ 29,252
Credit Card Derivative (Note 5) | Default rate | Applying a 0.9 multiplier to default rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Expected fair value with change in assumptions 58,663 48,556
Credit Card Derivative (Note 5) | Discount rate | 100 basis point increase in both discount rates    
Servicing Assets And Liabilities Fair Value [Line Items]    
Expected fair value with change in assumptions 47,654 38,225
Credit Card Derivative (Note 5) | Discount rate | 200 basis point increase in both discount rates    
Servicing Assets And Liabilities Fair Value [Line Items]    
Expected fair value with change in assumptions 47,036 37,725
Credit Card Derivative (Note 5) | Discount rate | 100 basis point decrease in both discount rates    
Servicing Assets And Liabilities Fair Value [Line Items]    
Expected fair value with change in assumptions 48,945 39,269
Credit Card Derivative (Note 5) | Discount rate | 200 basis point decrease in both discount rates    
Servicing Assets And Liabilities Fair Value [Line Items]    
Expected fair value with change in assumptions 49,619 39,814
Credit Card Servicing Obligation Liability    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability $ 9,276 $ 8,947
Credit Card Servicing Obligation Liability | Discount rate on Prosper Allocations    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, measurement input 0.2315 0.2244
Credit Card Servicing Obligation Liability | Prepayment rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, measurement input 0.0822 0.0814
Credit Card Servicing Obligation Liability | Prepayment rate | Applying a 1.1 multiplier to prepayment rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, expected fair value with change in assumptions $ 9,174 $ 8,849
Prepayment rate increase 110.00%  
Credit Card Servicing Obligation Liability | Prepayment rate | Applying a 0.9 multiplier to prepayment rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, expected fair value with change in assumptions $ 9,380 $ 9,047
Prepayment rate decrease 90.00%  
Credit Card Servicing Obligation Liability | Default rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, measurement input 0.1533 0.1565
Credit Card Servicing Obligation Liability | Default rate | Applying a 1.1 multiplier to default rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, expected fair value with change in assumptions $ 9,056 $ 8,730
Default rate increase 110.00%  
Credit Card Servicing Obligation Liability | Default rate | Applying a 0.9 multiplier to default rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, expected fair value with change in assumptions $ 9,501 $ 9,170
Default rate decrease 90.00%  
Credit Card Servicing Obligation Liability | Market servicing rate    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, measurement input 0.0200 0.0200
Credit Card Servicing Obligation Liability | Discount rate | Market servicing rate increase of 0.10%    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, expected fair value with change in assumptions $ 9,761 $ 9,415
Servicing rate increase 0.10%  
Credit Card Servicing Obligation Liability | Discount rate | Market servicing rate decrease of 0.10%    
Servicing Assets And Liabilities Fair Value [Line Items]    
Derivative liability, expected fair value with change in assumptions $ 8,792 $ 8,481
Servicing rate decrease 0.10%