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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, 2019
Dec. 31, 2018
Amortized Cost    
Due in one year or less $ 12,583  
Due from one year to five years 64,555  
Due from five to ten years 60,791  
Due after ten years 18,835  
Mortgage-backed securities 1,095,566  
Amortized Cost 1,252,330 $ 1,198,976
Estimated Fair Value    
Due in one year or less 12,627  
Due from one year to five years 65,511  
Due from five to ten years 62,583  
Due after ten years 19,158  
Mortgage-backed securities 1,113,365  
Estimated Fair Value $ 1,273,244 $ 1,192,423