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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, 2020
Dec. 31, 2019
Amortized Cost    
Due in one year or less $ 32,753  
Due from one year to five years 60,227  
Due from five to ten years 82,608  
Due after ten years 61,566  
Mortgage-backed securities 1,065,512  
Amortized Cost 1,302,666 $ 1,380,438
Estimated Fair Value    
Due in one year or less 33,022  
Due from one year to five years 61,576  
Due from five to ten years 84,851  
Due after ten years 62,708  
Mortgage-backed securities 1,110,883  
Estimated Fair Value $ 1,353,040 $ 1,403,403