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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Amortized Cost    
Due in one year or less $ 32,971  
Due from one year to five years 54,049  
Due from five to ten years 79,549  
Due after ten years 59,571  
Mortgage-backed securities 962,445  
Amortized Cost 1,188,585 $ 1,380,438
Estimated Fair Value    
Due in one year or less 33,230  
Due from one year to five years 55,792  
Due from five to ten years 82,322  
Due after ten years 61,790  
Mortgage-backed securities 1,005,762  
Estimated Fair Value $ 1,238,896 $ 1,403,403