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MARKETABLE SECURITIES - Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Sale of Marketable Securities [Abstract]
Proceeds	$ 199,974	$ 31,969	$ 214,736	$ 109,056
Gross gains	0	96	38	243
Gross losses	0	(32)	(13)	(161)
Held-to-maturity Securities, Sales, Excluding Other than Temporary Impairments [Abstract]
Proceeds from sales	0	0	923	1,866
Amortized cost	0	0	907	1,842
Gross realized gains	0	0	16	24
Tax expense related to securities gains/losses	$ 0	$ 0	$ (4)	$ (7)

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- Definition

Held-to-maturity Securities, Sold Security, Amortized Cost

+ References

No definition available.

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- Definition

Held-to-maturity Securities, Sold Security, Tax Expense (Benefit) On Realized Gain (Loss)

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- Definition

Marketable Securities, Gross Realized Gains

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Marketable Securities, Gross Realized Losses

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- Definition

Proceeds from the Sale of Marketable Securities

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- Definition

Sale Of Marketable Securities [Abstract]

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- Definition

This item represents the gain (loss) realized on the sale of held-to-maturity securities disposed of during the period. Additionally, this item may include, if not separately presented, any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt securities which are being or have been recognized in earnings during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563

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- Definition

The cash inflow associated with the sale of securities that had been designated as held-to-maturity. Excludes proceeds from maturities, prepayments and calls by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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