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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

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- 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 + Details
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