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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,337,397	$ 1,162,919
Fair Value	1,276,732	1,064,330
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	385,871	334,460
Fair Value	363,749	303,146
Agency | Mortgage-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	190,218	165,507
Fair Value	174,065	145,686
Non-agency | Mortgage-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	57,234	63,729
Fair Value	51,351	55,102
Auto loan receivables | Asset-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	62,783	53,686
Fair Value	63,208	52,869
Credit card receivables | Asset-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,673	3,414
Fair Value	9,789	3,428
Other receivables | Asset-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	65,963	48,124
Fair Value	$ 65,336	$ 46,061

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