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Available-for-Sale Debt Securities - Additional Information (Details) - position	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities in unrealized loss positions, number of positions (securities)	2,588	2,957

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- Definition

Debt Securities, Available For Sale, Unrealized Loss Position, Number Of Positions

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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