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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Available for Sale, Amortized Cost    
Due in one year or less $ 44,455  
Due after one year through five years 43,905  
Due after five years through ten years 69,693  
Due after ten years 44,567  
Total 1,135,728  
Available for Sale, Estimated Fair Value    
Due in one year or less 44,638  
Due after one year through five years 44,632  
Due after five years through ten years 72,675  
Due after ten years 45,629  
Available-for-sale debt securities, at fair value 1,168,594 $ 1,126,983
Equity securities, at fair value 1,209 1,127
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]    
Available for Sale, Amortized Cost    
Mortgage-backed securities 692,989  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 714,477  
Available-for-sale debt securities, at fair value 714,477 677,822
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 77,743  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 80,665  
Available-for-sale debt securities, at fair value 80,665 81,225
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 30,697  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 32,086  
Available-for-sale debt securities, at fair value 32,086 37,191
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 131,679  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 133,792  
Available-for-sale debt securities, at fair value 133,792 137,817
Equity securities    
Available for Sale, Estimated Fair Value    
Equity securities, at amortized cost 1,064 935
Equity securities, at fair value $ 1,209 $ 1,127