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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Amortized Cost    
Due in one year or less $ 35,577  
Due from one year to five years 56,870  
Due from five to ten years 68,527  
Due after ten years 54,292  
Mortgage-backed securities 855,083  
Amortized Cost 1,070,349 $ 1,380,438
Estimated Fair Value    
Due in one year or less 35,851  
Due from one year to five years 58,892  
Due from five to ten years 71,211  
Due after ten years 56,555  
Mortgage-backed securities 894,927  
Estimated Fair Value $ 1,117,436 $ 1,403,403