Fair Value Measurements - Narrative (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 1,620,262	$ 345,702
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 1,249,796	$ 12,469
Discount rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input, debt securities available-for-sale	0.070
Discount rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input, debt securities available-for-sale	0.070
Discount rate | Weighted- Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input, debt securities available-for-sale	0.070
Senior asset-backed securities related to Structured Program transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 1,176,403
Effect of 100 basis point increase in discount rate	18,000
Effect of 200 basis point increase in discount rate	36,000
Senior asset-backed securities related to Structured Program transactions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 1,176,403
Senior asset-backed securities related to Structured Program transactions | Weighted- Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected remaining weighted-average life (in years)	1 year 6 months