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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Held to Maturity, Amortized Cost    
Mortgage-backed securities $ 152,852  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 146,466  
Available for Sale, Amortized Cost    
Due in one year or less 63,878  
Due after one year through five years 103,852  
Due after five years through ten years 50,639  
Due after ten years 57,279  
Total 1,269,884  
Available for Sale, Estimated Fair Value    
Due in one year or less 63,916  
Due after one year through five years 103,115  
Due after five years through ten years 49,629  
Due after ten years 55,944  
Available-for-sale debt securities, at fair value 1,233,002 $ 1,304,066
Equity securities, at fair value 885 825
Residential - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 87,356  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 83,017  
Available for Sale, Amortized Cost    
Mortgage-backed securities 763,635  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 734,357  
Available-for-sale debt securities, at fair value 734,357 800,683
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 53,618  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 51,205  
Available-for-sale debt securities, at fair value 51,205 39,725
Commercial - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 65,496  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 63,449  
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 42,069  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 41,370  
Available-for-sale debt securities, at fair value 41,370 46,763
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 134,914  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 133,466  
Available-for-sale debt securities, at fair value 133,466 137,326
Equity securities    
Available for Sale, Estimated Fair Value    
Equity securities, at amortized cost 712 686
Equity securities, at fair value $ 885 $ 825