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FAIR VALUE MEASUREMENTS - Summary of valuation of financial instruments measured at fair value on recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale securities |  |
Fair Value | $ 34,954 | $ 37,484
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 | $ 6,491 | $ 6,575
Available-for-sale securities |  |
Total | 34,954 | 37,484
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Municipal Obligations |  |
Available-for-sale securities |  |
Fair Value | 30,996 | 32,080
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Corporate Obligations |  |
Available-for-sale securities |  |
Fair Value | $ 3,958 | $ 5,404
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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