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ACCUMULATED OTHER COMPREHENSIVE LOSS (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gains reclassified from AOCL	$ 11,392
Accumulated Net Investment Gain (Loss) Attributable to Parent | Other Income, net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gains reclassified from AOCL	2,300
Accumulated Net Investment Gain (Loss) Attributable to Parent | Interest income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gains reclassified from AOCL	7,400
Accumulated Net Investment Gain (Loss) Attributable to Parent | Interest Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gains reclassified from AOCL	$ 1,700

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580

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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
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