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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Available for Sale, Amortized Cost    
Due in one year or less $ 48,598  
Due after one year through five years 46,887  
Due after five years through ten years 63,133  
Due after ten years 41,281  
Total 1,159,727  
Available for Sale, Estimated Fair Value    
Due in one year or less 48,784  
Due after one year through five years 47,163  
Due after five years through ten years 64,548  
Due after ten years 41,448  
Available-for-sale debt securities, at fair value 1,184,023 $ 1,126,983
Equity securities, at fair value 1,002 1,127
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]    
Available for Sale, Amortized Cost    
Mortgage-backed securities 716,398  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 735,050  
Available-for-sale debt securities, at fair value 735,050 677,822
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 77,612  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 80,319  
Available-for-sale debt securities, at fair value 80,319 81,225
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 34,113  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 34,672  
Available-for-sale debt securities, at fair value 34,672 37,191
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 131,705  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 132,039  
Available-for-sale debt securities, at fair value 132,039 137,817
Equity securities    
Available for Sale, Estimated Fair Value    
Equity securities, at amortized cost 961 935
Equity securities, at fair value $ 1,002 $ 1,127