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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Agency Notes [Member]    
Debt securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months $ 5,078  
12 Consecutive Months or Longer 0  
Total 5,078  
Debt securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 4  
12 Consecutive Months or Longer 0  
Total 4  
Registered Mutual Funds [Member]    
Investment securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months   $ 0
12 Consecutive Months or Longer   2,591
Total   2,591
Investment securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months   0
12 Consecutive Months or Longer   84
Total   84
Pass-through MBS Issued by GSEs [Member]    
Debt securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 278,633  
12 Consecutive Months or Longer 0  
Total 278,633  
Debt securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 3,438  
12 Consecutive Months or Longer 0  
Total 3,438  
Investment securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months   55,819
12 Consecutive Months or Longer   0
Total   55,819
Investment securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months   325
12 Consecutive Months or Longer   0
Total   325
Agency CMO [Member]    
Debt securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 39,577  
12 Consecutive Months or Longer 4,702  
Total 44,279  
Debt securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 1,151  
12 Consecutive Months or Longer 109  
Total $ 1,260  
Investment securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months   86,746
12 Consecutive Months or Longer   3,168
Total   89,914
Investment securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months   96
12 Consecutive Months or Longer   69
Total   $ 165