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INVESTMENTS (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
INVESTMENTS
Interest income	¥ 7,593	¥ 846	¥ 0
Held-to-maturity investments
Gross unrecognized holding gains	0
Gross unrecognized holding losses	0
Available-for-sale investments
Changes in fair value of the available-for-sale investments, net of tax	¥ 0	¥ 0

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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-Publisher FASB
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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