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INVESTMENT AND MORTGAGE-BACKED SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Pass-through MBS issued by GSEs    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months $ 446,864 $ 5,007
12 Consecutive Months or Longer 0 0
Total 446,864 5,007
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 6,273 31
12 Consecutive Months or Longer 0 0
Total 6,273 31
Treasury Securities    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 231,984  
12 Consecutive Months or Longer 0  
Total 231,984  
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 482  
12 Consecutive Months or Longer 0  
Total 482  
State and municipal obligations    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 16,412  
12 Consecutive Months or Longer 0  
Total 16,412  
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 178  
12 Consecutive Months or Longer 0  
Total 178  
Agency Notes    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 81,018 22,409
12 Consecutive Months or Longer 0 0
Total 81,018 22,409
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 1,457 91
12 Consecutive Months or Longer 0 0
Total 1,457 91
Corporate Notes    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 17,863  
12 Consecutive Months or Longer 0  
Total 17,863  
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 401  
12 Consecutive Months or Longer 0  
Total 401  
Agency Collateralized Mortgage Obligations ("CMOs")    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 347,726 6,563
12 Consecutive Months or Longer 0 4,954
Total 347,726 11,517
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 5,118 30
12 Consecutive Months or Longer 0 46
Total $ 5,118 $ 76