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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Held to Maturity, Amortized Cost    
Mortgage-backed securities $ 226,573  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 230,529  
Available for Sale, Amortized Cost    
Due in one year or less 13,648  
Due after one year through five years 124,029  
Due after five years through ten years 73,338  
Due after ten years 81,500  
Total 1,231,619  
Available for Sale, Estimated Fair Value    
Due in one year or less 13,676  
Due after one year through five years 127,061  
Due after five years through ten years 75,987  
Due after ten years 84,662  
Available-for-sale, at fair value 1,262,224 $ 1,272,255
Residential - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 132,470  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 133,358  
Available for Sale, Amortized Cost    
Mortgage-backed securities 747,636  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 759,203  
Available-for-sale, at fair value 759,203 771,909
Commercial - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 94,103  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 97,171  
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 55,480  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 57,622  
Available-for-sale, at fair value 57,622 64,032
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 135,296  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 143,229  
Available-for-sale, at fair value 143,229 136,354
Other    
Available for Sale, Amortized Cost    
Other 692  
Available for Sale, Estimated Fair Value    
Other 784  
Available-for-sale, at fair value $ 784 $ 916