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MARKETABLE SECURITIES - Narrative (Details)
 9 Months Ended
Sep. 30, 2017
USD ($)
security
position
Sep. 30, 2016
security
Dec. 31, 2016
USD ($)
position
Schedule of Available-for-sale Securities [Line Items]      
Carrying value $ 179,081,000   $ 189,371,000
Unrealized losses 1,085,000   4,700,000
Other than temporary impairment losses on debt securities related to credit losses $ 0   $ 0
Number of investment positions in an unrealized loss position | position 104   177
Fair value of securities pledged as collateral $ 221,777,000   $ 259,499,000
Number of held-to-maturity securities sold | security 3 3  
Non-Agency Collateralized Mortgage Obligations      
Schedule of Available-for-sale Securities [Line Items]      
Carrying value $ 1,470,000    
Unrealized losses $ 503,000