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FAIR VALUE MEASUREMENTS - Summary of valuation of financial instruments measured at fair value on recurring basis (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Available-for-sale securities
Fair Value	$ 44,430	$ 36,588
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets, Level 1
Assets:
Trading securities
Available-for-sale securities
Total
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets, Level 1 | Municipal Obligations
Available-for-sale securities
Fair Value
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets, Level 1 | Corporate Obligations
Available-for-sale securities
Fair Value
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2
Assets:
Trading securities	6,531	6,388
Available-for-sale securities
Total	44,430	36,588
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Municipal Obligations
Available-for-sale securities
Fair Value	41,758	36,132
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Corporate Obligations
Available-for-sale securities
Fair Value	2,672	456
Fair Value, Measurements, Recurring | Significant unobservable inputs, Level 3
Assets:
Trading securities
Available-for-sale securities
Total
Fair Value, Measurements, Recurring | Significant unobservable inputs, Level 3 | Municipal Obligations
Available-for-sale securities
Fair Value
Fair Value, Measurements, Recurring | Significant unobservable inputs, Level 3 | Corporate Obligations
Available-for-sale securities
Fair Value

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

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- Definition

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

+ References

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)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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