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Quarterly Financial Information (Unaudited) - Other-than-temporary Impairment Loss on Held-to-maturity Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2017
Other-than-temporary Impairment Loss, Debt Securities, Held-to-maturity, before Tax [Abstract] |  |
Net impairment loss recognized in earnings on held-to-maturity securities |  | $ 35,418
Bonds B Series [Member] |  |
Other-than-temporary Impairment Loss, Debt Securities, Held-to-maturity, before Tax [Abstract] |  |
Net impairment loss recognized in earnings on held-to-maturity securities | $ 35,400 |

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- Definition Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
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