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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Securities (Details) - USD ($) $ in Millions		3 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Accounting Policies [Abstract]
Held-to maturity securities transferred	$ 740.9
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale		$ 22.0

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- References

No definition available.

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- Definition

Amount of investment in debt security, measured at amortized cost, transferred to investment in debt security, measured at fair value, with change in fair value recognized in other comprehensive income (available-for-sale) and net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
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Amount before tax and reclassification adjustments of 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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