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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Held to Maturity, Amortized Cost    
Mortgage-backed securities $ 158,156  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 152,330  
Available for Sale, Amortized Cost    
Due in one year or less 35,234  
Due after one year through five years 132,627  
Due after five years through ten years 50,044  
Due after ten years 60,389  
Total 1,308,514  
Available for Sale, Estimated Fair Value    
Due in one year or less 35,259  
Due after one year through five years 132,431  
Due after five years through ten years 49,512  
Due after ten years 59,651  
Available-for-sale debt securities, at fair value 1,279,969 $ 1,304,066
Equity securities, at fair value 844 825
Residential - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 92,247  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 88,334  
Available for Sale, Amortized Cost    
Mortgage-backed securities 797,679  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 773,725  
Available-for-sale debt securities, at fair value 773,725 800,683
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 54,429  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 52,423  
Available-for-sale debt securities, at fair value 52,423 39,725
Commercial - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 65,909  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 63,996  
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 43,150  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 42,846  
Available-for-sale debt securities, at fair value 42,846 46,763
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 134,962  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 134,122  
Available-for-sale debt securities, at fair value 134,122 137,326
Equity securities    
Available for Sale, Estimated Fair Value    
Equity securities, at amortized cost 692 686
Equity securities, at fair value $ 844 $ 825