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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due within one year $ 0  
Due after one year through five years 1,086  
Due after five years through ten years 17,756  
Due after ten years 7,769  
Available-for-sale debt securities, amortized cost basis 238,992  
Estimated Fair Value    
Due within one year 0  
Due after one year through five years 1,096  
Due after five years through ten years 17,924  
Due after ten years 7,464  
Available-for-sale debt securities, estimated fair value 238,133  
Amortized Cost    
Due within one year 2,683  
Due after one year through five years 5,126  
Due after five years through ten years 43,228  
Due after ten years 95,956  
Amortized Cost 179,081 $ 189,371
Estimated Fair Value    
Due within one year 2,693  
Due after one year through five years 5,292  
Due after five years through ten years 44,785  
Due after ten years 96,403  
Held-to-maturity securities, estimated fair value 181,151 $ 186,155
Mortgage-backed securities    
Amortized Cost    
Available-for-sale securities without single maturity date 91,801  
Estimated Fair Value    
Available-for-sale securities without single maturity date 90,958  
Amortized Cost    
Held-to-maturity securities, without single maturity date 23,337  
Estimated Fair Value    
Held-to-maturity securities, without single maturity date 23,549  
Collateralized mortgage obligations    
Amortized Cost    
Available-for-sale securities without single maturity date 120,580  
Estimated Fair Value    
Available-for-sale securities without single maturity date 120,691  
Amortized Cost    
Held-to-maturity securities, without single maturity date 8,751  
Estimated Fair Value    
Held-to-maturity securities, without single maturity date $ 8,429