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MARKETABLE SECURITIES - Narrative (Details)
 3 Months Ended
Mar. 31, 2016
security
Mar. 31, 2017
USD ($)
position
Dec. 31, 2016
USD ($)
position
Schedule of Available-for-sale Securities [Line Items]      
Securities held to maturity   $ 185,837,000 $ 189,371,000
Unrealized losses   3,414,000 4,700,000
Other than temporary impairment losses on debt securities related to credit losses   $ 0 $ 0
Number of positions in an unrealized loss position | position   152 177
Fair value of securities pledged as collateral   $ 264,248,000 $ 259,499,000
Number of held-to-maturity securities sold | security 3    
Non-Agency Collateralized Mortgage Obligations      
Schedule of Available-for-sale Securities [Line Items]      
Securities held to maturity   1,493,000  
Unrealized losses   $ 602,000