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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 831,127	$ 653,715
Fair Value	820,438	649,334
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	312,840	221,956
Fair Value	309,597	219,452
Agency | Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	139,418	118,014
Fair Value	136,291	116,014
Non-agency | Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	61,689	17,676
Fair Value	61,933	17,488
Auto loan receivables | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	53,449	35,105
Fair Value	53,341	34,962
Credit card receivables | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,594	38,844
Fair Value	29,366	38,719
Other receivables | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28,690	12,317
Fair Value	$ 28,666	$ 12,269

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=82897076&loc=d3e27161-111563

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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 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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+ References

No definition available.

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