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Loans - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Transfer of securitization investments qualifying for sale accounting treatment $ 0 $ 0 $ 0 $ 0  
Provision for credit losses 13,755,000 10,035,000 22,650,000 15,713,000  
Personal loans          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Deconsolidation of debt 0 $ 0 0    
Student Loans          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Deconsolidation of debt       $ 13,200,000  
Secured loans          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Secured loans, amortized cost basis $ 614,100,000   $ 614,100,000   $ 872,300,000
Secured loan, term, up to     7 years    
Provision for credit losses     $ 0   $ 0