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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, 2018
Dec. 31, 2017
Amortized Cost    
Due in one year or less $ 11,606  
Due from one year to five years 46,869  
Due from five to ten years 64,190  
Due after ten years 40,290  
Mortgage-backed securities 699,990  
Amortized Cost 862,945 $ 813,293
Estimated Fair Value    
Due in one year or less 11,643  
Due from one year to five years 46,432  
Due from five to ten years 64,842  
Due after ten years 40,454  
Mortgage-backed securities 685,214  
Estimated Fair Value $ 848,585 $ 810,873