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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortized Cost    
Due in one year or less $ 20,247  
Due from one year to five years 48,460  
Due from five to ten years 59,558  
Due after ten years 44,449  
Mortgage-backed securities 654,015  
Amortized Cost 826,729 $ 940,580
Estimated Fair Value    
Due in one year or less 20,462  
Due from one year to five years 50,244  
Due from five to ten years 61,722  
Due after ten years 45,389  
Mortgage-backed securities 681,835  
Estimated Fair Value $ 859,652 $ 982,879