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MARKETABLE SECURITIES - Sale of Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Sale of Marketable Securities [Abstract]
Proceeds	$ 411,796	$ 217,111	$ 105,808
Gross gains	4	180	243
Gross losses	(54)	(13)	(161)
Debt Securities, Held-to-maturity, Sale, Excluding Other-than-temporary Impairment [Abstract]
Proceeds from sales	$ 0	3,298	1,866
Amortized cost		3,140	1,842
Gross realized gains		158	24
Tax expense related to securities gains/losses		$ (44)	$ (7)

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- Definition

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

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

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Proceeds from the Sale of Marketable Securities

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Sale Of Marketable Securities [Abstract]

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- Definition

Amount of gain (loss) on sale of investment in debt security measured at amortized cost (held-to-maturity), including other-than-temporary impairment (OTTI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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