FAIR VALUE MEASUREMENTS: AFS (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Available for Sale:
Amortized Cost	$ 135,449	$ 131,868
Fair Value	134,501	131,347
Unrealized Gains		7
Unrealized Losses	(948)	(528)
Municipal bonds
Available for Sale:
Amortized Cost	34,021	51,797
Fair Value	33,977	51,804
Unrealized Gains		7
Unrealized Losses	(44)
Corporate bonds
Available for Sale:
Amortized Cost	95,286	72,587
Fair Value	94,403	72,075
Unrealized Losses	(883)	(512)
Government securities
Available for Sale:
Amortized Cost	2,430	2,450
Fair Value	2,430	2,446
Unrealized Losses		(4)
Certificates of deposit
Available for Sale:
Amortized Cost	3,692	5,014
Fair Value	3,676	5,007
Unrealized Losses	(16)	(7)
Mutual funds
Available for Sale:
Amortized Cost	20	20
Fair Value	15	15
Unrealized Losses	$ (5)	$ (5)

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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-Name Accounting Standards Codification
-Topic 320
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-Section 50
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