Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Details) - Level 3	Jun. 30, 2023	Dec. 31, 2022
Minimum | Remaining cumulative charge-offs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.0371
Minimum | Remaining cumulative prepayments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0
Minimum | Average life (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.34
Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.2400
Maximum | Remaining cumulative charge-offs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.1831
Maximum | Remaining cumulative prepayments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.3487
Maximum | Average life (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.56
Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.2400
Weighted Average | Remaining cumulative charge-offs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.0911
Weighted Average | Remaining cumulative prepayments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.2375
Weighted Average | Average life (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.28
Weighted Average | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.2400
Personal Loans | Minimum | Remaining cumulative charge-offs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.0764	0.0506
Personal Loans | Minimum | Remaining cumulative prepayments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0	0
Personal Loans | Minimum | Average life (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.05	0.05
Personal Loans | Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.1110	0.1134
Personal Loans | Maximum | Remaining cumulative charge-offs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.5248	0.5145
Personal Loans | Maximum | Remaining cumulative prepayments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.3155	0.3359
Personal Loans | Maximum | Average life (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	1.44	1.52
Personal Loans | Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.1110	0.1134
Personal Loans | Weighted Average | Remaining cumulative charge-offs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.1103	0.0986
Personal Loans | Weighted Average | Remaining cumulative prepayments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.2687	0.2873
Personal Loans | Weighted Average | Average life (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.96	1.01
Personal Loans | Weighted Average | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.1110	0.1134
Credit Card | Remaining cumulative charge-offs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.1954	0.2280
Credit Card | Principal payment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.0790	0.0928
Credit Card | Average life (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.88	0.69
Credit Card | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs for unsecured personal loan portfolio	0.1115	0.1484