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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Available for Sale, Amortized Cost    
Due in one year or less $ 27,260  
Due after one year through five years 40,800  
Due after five years through ten years 89,879  
Due after ten years 91,136  
Total 1,136,535  
Available for Sale, Estimated Fair Value    
Due in one year or less 27,378  
Due after one year through five years 42,098  
Due after five years through ten years 92,226  
Due after ten years 92,389  
Available-for-sale debt securities, at fair value 1,166,319 $ 1,126,983
Equity securities, at fair value 1,204 1,127
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]    
Available for Sale, Amortized Cost    
Mortgage-backed securities 743,786  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 763,326  
Available-for-sale debt securities, at fair value 763,326 677,822
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 71,335  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 73,786  
Available-for-sale debt securities, at fair value 73,786 81,225
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 27,525  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 28,676  
Available-for-sale debt securities, at fair value 28,676 37,191
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 44,814  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 46,440  
Available-for-sale debt securities, at fair value 46,440 137,817
Equity securities    
Available for Sale, Estimated Fair Value    
Equity securities, at amortized cost 1,027 935
Equity securities, at fair value $ 1,204 $ 1,127