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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Held to Maturity, Amortized Cost    
Mortgage-backed securities $ 234,230  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 238,066  
Available for Sale, Amortized Cost    
Due in one year or less 18,708  
Due after one year through five years 107,229  
Due after five years through ten years 79,695  
Due after ten years 87,477  
Total 1,226,539  
Available for Sale, Estimated Fair Value    
Due in one year or less 18,803  
Due after one year through five years 110,523  
Due after five years through ten years 83,380  
Due after ten years 91,081  
Available-for-sale, at fair value 1,260,593 $ 1,272,255
Residential - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 139,626  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 140,461  
Available for Sale, Amortized Cost    
Mortgage-backed securities 738,692  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 750,663  
Available-for-sale, at fair value 750,663 771,909
Commercial - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 94,604  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 97,605  
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 58,734  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 61,470  
Available-for-sale, at fair value 61,470 64,032
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 135,344  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 143,933  
Available-for-sale, at fair value 143,933 136,354
Other    
Available for Sale, Amortized Cost    
Other 660  
Available for Sale, Estimated Fair Value    
Other 740  
Available-for-sale, at fair value $ 740 $ 916