Business, Basis of Presentation and Significant Accounting Policies - Securities Lending (Details)	12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]
Rate required of collateral as a percent of market value of loans securities	102.00%

Securities Loaned, Rate Required of Collateral as a Percent of Market Value of Loans Securities

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration