Fair Value of Assets and Liabilities - Narratives (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 795,669	$ 345,702
Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 443,459	$ 12,469
Discount rates | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input, debt securities available-for-sale	0.077
Discount rates | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input, debt securities available-for-sale	0.077
Discount rates | Weighted- Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input, debt securities available-for-sale	0.077
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	$ 412,397
Effect of 100 basis point increase in discount rate	6,200
Effect of 200 basis point increase in discount rate	12,300
Senior asset-backed securities related to Structured Program transactions | Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 412,397
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 weighted-average life (in years)	1 year 6 months