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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Pass-through MBS issued by GSEs    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months $ 181,917 $ 5,007
12 Consecutive Months or Longer 0 0
Total 181,917 5,007
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 4,788 31
12 Consecutive Months or Longer 0 0
Total 4,788 31
Treasury Securities    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 92,272  
12 Consecutive Months or Longer 0  
Total 92,272  
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 275  
12 Consecutive Months or Longer 0  
Total 275  
State and municipal obligations    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 19,004  
12 Consecutive Months or Longer 0  
Total 19,004  
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 288  
12 Consecutive Months or Longer 0  
Total 288  
Agency Notes    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 69,570 22,409
12 Consecutive Months or Longer 0 0
Total 69,570 22,409
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 2,930 91
12 Consecutive Months or Longer 0 0
Total 2,930 91
Corporate Notes [Member]    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 18,278  
12 Consecutive Months or Longer 0 0
Total 18,278  
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 420  
12 Consecutive Months or Longer 0 0
Total 420  
Agency Collateralized Mortgage Obligations ("CMOs")    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 239,145 6,563
12 Consecutive Months or Longer 0 4,954
Total 239,145 11,517
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 6,324 30
12 Consecutive Months or Longer 0 46
Total $ 6,324 $ 76