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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Held to Maturity, Amortized Cost    
Mortgage-backed securities $ 241,597  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 243,072  
Available for Sale, Amortized Cost    
Due in one year or less 21,256  
Due after one year through five years 104,442  
Due after five years through ten years 78,885  
Due after ten years 89,610  
Total 1,274,800  
Available for Sale, Estimated Fair Value    
Due in one year or less 21,454  
Due after one year through five years 107,027  
Due after five years through ten years 81,183  
Due after ten years 91,934  
Available-for-sale, at fair value 1,299,176 $ 1,272,255
Available for sale    
Investment securities pledged to party with no right to sell or repledge the collateral 1,000,000 1,000,000
Residential - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 146,497  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 146,242  
Available for Sale, Amortized Cost    
Mortgage-backed securities 782,288  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 791,646  
Available-for-sale, at fair value 791,646 771,909
Commercial - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 95,100  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 96,830  
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 62,274  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 64,240  
Available-for-sale, at fair value 64,240 64,032
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 135,392  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 140,970  
Available-for-sale, at fair value 140,970 136,354
Other    
Available for Sale, Amortized Cost    
Other 653  
Available for Sale, Estimated Fair Value    
Other 722  
Available-for-sale, at fair value $ 722 $ 916