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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 |  |

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- 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) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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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) -URI http://asc.fasb.org/extlink&oid=28360136&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 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 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 -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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