The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562

Name:	us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Investments - Additional Information (Details)	3 Months Ended
Investments - Additional Information (Details)	Mar. 31, 2018 USD ($) Issue	Mar. 31, 2017 USD ($)	Dec. 31, 2017 Issue
Gain (Loss) on Investments [Line Items]
Total issues of fixed maturity portfolio \| Issue	1,529		1,502
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Other than-temporary impairment, available for sale securities	$ 0
Other than temporary impairment, available for sale securities, net of tax		$ 0