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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Held to Maturity, Amortized Cost    
Mortgage-backed securities $ 204,588  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 203,334  
Available for Sale, Amortized Cost    
Due in one year or less 8,807  
Due after one year through five years 144,860  
Due after five years through ten years 53,401  
Due after ten years 95,007  
Total 1,310,721  
Available for Sale, Estimated Fair Value    
Due in one year or less 8,866  
Due after one year through five years 146,731  
Due after five years through ten years 54,410  
Due after ten years 96,253  
Available-for-sale, at fair value 1,315,895 $ 1,243,847
Residential - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 112,053  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 110,324  
Available for Sale, Amortized Cost    
Mortgage-backed securities 791,720  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 788,338  
Available-for-sale, at fair value 788,338 769,986
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 32,659  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 32,548  
Available-for-sale, at fair value 32,548  
Commercial - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 92,535  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 93,010  
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 48,420  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 48,954  
Available-for-sale, at fair value 48,954 51,547
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 135,153  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 138,986  
Available-for-sale, at fair value 138,986 137,224
Other    
Available for Sale, Amortized Cost    
Other 694  
Available for Sale, Estimated Fair Value    
Other 809  
Available-for-sale, at fair value $ 809 $ 660