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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Held to Maturity, Amortized Cost    
Mortgage-backed securities $ 177,078  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 171,399  
Available for Sale, Amortized Cost    
Due in one year or less 13,691  
Due after one year through five years 156,766  
Due after five years through ten years 49,619  
Due after ten years 63,271  
Total 1,349,380  
Available for Sale, Estimated Fair Value    
Due in one year or less 13,702  
Due after one year through five years 156,598  
Due after five years through ten years 49,279  
Due after ten years 62,853  
Available-for-sale debt securities, at fair value 1,326,092 $ 1,304,066
Equity securities, at fair value 753 825
Residential - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 96,619  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 93,138  
Available for Sale, Amortized Cost    
Mortgage-backed securities 831,728  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 811,322  
Available-for-sale debt securities, at fair value 811,322 800,683
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 54,628  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 53,457  
Available-for-sale debt securities, at fair value 53,457 39,725
Commercial - U.S. Government-sponsored entities    
Held to Maturity, Amortized Cost    
Mortgage-backed securities 80,459  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 78,261  
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 44,667  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 44,440  
Available-for-sale debt securities, at fair value 44,440 46,763
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 135,010  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 134,441  
Available-for-sale debt securities, at fair value 134,441 137,326
Equity securities    
Available for Sale, Estimated Fair Value    
Available-for-sale Equity Securities, Amortized Cost Basis 619 686
Equity securities, at fair value $ 753 $ 825