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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,039,042	$ 815,647
Fair Value	1,029,157	819,861
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	336,881	319,377
Fair Value	333,754	319,937
Agency | Mortgage-backed Securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	149,850	153,937
Fair Value	147,723	153,758
Non-agency | Mortgage-backed Securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	68,025	54,231
Fair Value	66,940	54,666
Auto loan receivables | Asset-backed Securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	71,716	68,188
Fair Value	71,764	68,440
Credit card receivables | Asset-backed Securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,756	7,878
Fair Value	4,749	7,891
Other receivables | Asset-backed Securities:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	42,534	35,143
Fair Value	$ 42,578	$ 35,182

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

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-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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