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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Pass-through MBS issued by GSEs    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months $ 177,409 $ 5,007
12 Consecutive Months or Longer 0 0
Total 177,409 5,007
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 1,945 31
12 Consecutive Months or Longer 0 0
Total 1,945 31
Treasury Securities    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 70,963  
12 Consecutive Months or Longer 0  
Total 70,963  
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 100  
12 Consecutive Months or Longer 0  
Total 100  
State and municipal obligations    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 7,723  
12 Consecutive Months or Longer 0  
Total 7,723  
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 108  
12 Consecutive Months or Longer 0  
Total 108  
Agency Notes    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 81,035 22,409
12 Consecutive Months or Longer 0 0
Total 81,035 22,409
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 1,439 91
12 Consecutive Months or Longer 0 0
Total 1,439 91
Corporate Notes    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 6,855  
12 Consecutive Months or Longer 0  
Total 6,855  
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 56  
12 Consecutive Months or Longer 0  
Total 56  
Agency CMOs [Member]    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 235,036 6,563
12 Consecutive Months or Longer 0 4,954
Total 235,036 11,517
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 3,691 30
12 Consecutive Months or Longer 0 46
Total $ 3,691 $ 76