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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Held to Maturity, Amortized Cost    
Mortgage-backed securities $ 211,426  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 208,181  
Available for Sale, Amortized Cost    
Due in one year or less 6,172  
Due after one year through five years 147,830  
Due after five years through ten years 52,250  
Due after ten years 70,505  
Total 1,302,300  
Available for Sale, Estimated Fair Value    
Due in one year or less 6,241  
Due after one year through five years 149,514  
Due after five years through ten years 52,852  
Due after ten years 71,149  
Available-for-sale, at fair value 1,302,889 $ 1,243,847
Residential - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 118,372  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 116,197  
Available for Sale, Amortized Cost    
Mortgage-backed securities 826,491  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 821,372  
Available-for-sale, at fair value 821,372 769,986
Commercial - U.S. Government-sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 13,419  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 13,460  
Available-for-sale, at fair value 13,460  
Commercial - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 93,054  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 91,984  
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 49,848  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 49,517  
Available-for-sale, at fair value 49,517 51,547
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 135,201  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 138,102  
Available-for-sale, at fair value 138,102 137,224
Other    
Available for Sale, Amortized Cost    
Other 584  
Available for Sale, Estimated Fair Value    
Other 682  
Available-for-sale, at fair value $ 682 $ 660