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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, 2019
Dec. 31, 2018
Amortized Cost    
Due in one year or less $ 16,799  
Due from one year to five years 74,218  
Due from five to ten years 67,248  
Due after ten years 29,347  
Mortgage-backed securities 1,283,846  
Amortized Cost 1,471,458 $ 1,198,976
Estimated Fair Value    
Due in one year or less 16,858  
Due from one year to five years 75,228  
Due from five to ten years 69,498  
Due after ten years 30,043  
Mortgage-backed securities 1,299,580  
Estimated Fair Value $ 1,491,207 $ 1,192,423