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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Amortized Cost    
Due within one year $ 0  
Due after one year through five years 7,444  
Due after five years through ten years 17,779  
Due after ten years 7,817  
Available-for-sale debt securities, amortized cost basis 216,494  
Estimated Fair Value    
Due within one year 0  
Due after one year through five years 7,478  
Due after five years through ten years 17,695  
Due after ten years 7,278  
Available-for-sale debt securities, estimated fair value 214,463  
Amortized Cost    
Due within one year 1,050  
Due after one year through five years 5,577  
Due after five years through ten years 40,910  
Due after ten years 100,983  
Amortized Cost 185,837 $ 189,371
Estimated Fair Value    
Due within one year 1,055  
Due after one year through five years 5,722  
Due after five years through ten years 41,560  
Due after ten years 98,990  
Held-to-maturity securities, estimated fair value 184,412 $ 186,155
Mortgage-backed securities    
Amortized Cost    
Available-for-sale securities without single maturity date 80,766  
Estimated Fair Value    
Available-for-sale securities without single maturity date 79,545  
Amortized Cost    
Held-to-maturity securities, without single maturity date 26,900  
Estimated Fair Value    
Held-to-maturity securities, without single maturity date 27,021  
Collateralized mortgage obligations    
Amortized Cost    
Available-for-sale securities without single maturity date 102,688  
Estimated Fair Value    
Available-for-sale securities without single maturity date 102,467  
Amortized Cost    
Held-to-maturity securities, without single maturity date 10,417  
Estimated Fair Value    
Held-to-maturity securities, without single maturity date $ 10,064