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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due in one year or less $ 14,094  
Due from one year to five years 57,385  
Due from five to ten years 77,194  
Due after ten years 39,221  
Mortgage-backed securities 626,927  
Amortized Cost 814,821 $ 824,635
Estimated Fair Value    
Due in one year or less 14,205  
Due from one year to five years 58,204  
Due from five to ten years 79,093  
Due after ten years 40,138  
Mortgage-backed securities 627,953  
Estimated Fair Value $ 819,593 $ 822,735