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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, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 840,646	$ 828,336
Fair Value	842,574	855,284
Mortgage-Backed and Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	251,199	304,285
Fair Value	253,002	311,079
Agency [Member] | Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	166,418	143,723
Fair Value	168,027	144,729
Non Agency [Member] | Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28,090	71,140
Fair Value	28,259	75,896
Auto Loan Receivables [Member] | Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,811	42,767
Fair Value	31,938	43,127
Credit Card Receivables [Member] | Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,712	21,145
Fair Value	6,712	21,487
Other Receivables [Member] | Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,168	25,510
Fair Value	$ 18,066	$ 25,840

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=121645371&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=121558606&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
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

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