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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,316,419	$ 1,162,919
Fair Value	1,215,630	1,064,330
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	380,581	334,460
Fair Value	347,131	303,146
Agency | Mortgage-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	187,979	165,507
Fair Value	165,097	145,686
Non-agency | Mortgage-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	56,990	63,729
Fair Value	48,963	55,102
Auto loan receivables | Asset-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	66,262	53,686
Fair Value	65,805	52,869
Credit card receivables | Asset-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,644	3,414
Fair Value	9,636	3,428
Other receivables | Asset-backed securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,706	48,124
Fair Value	$ 57,630	$ 46,061

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