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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
INVESTMENT SECURITIES    
Equity securities, at fair value $ 1,578 $ 1,351
Available for Sale, Amortized Cost    
Due in one year or less 23,390  
Due after one year through five years 27,513  
Due after five years through ten years 90,757  
Due after ten years 139,235  
Total 1,402,024  
Available for Sale, Estimated Fair Value    
Due in one year or less 23,497  
Due after one year through five years 28,430  
Due after five years through ten years 91,326  
Due after ten years 139,923  
Available-for-sale debt securities, at fair value 1,407,340 1,182,609
Equity securities    
INVESTMENT SECURITIES    
Equity securities, at amortized cost 1,194 1,068
Equity securities, at fair value 1,578 1,351
Residential - U.S. Government-sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 984,750  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 984,678  
Available-for-sale debt securities, at fair value 984,678 778,826
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 79,970  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 81,466  
Available-for-sale debt securities, at fair value 81,466 87,469
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 15,091  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 15,446  
Available-for-sale debt securities, at fair value 15,446 23,423
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 41,318  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 42,574  
Available-for-sale debt securities, at fair value $ 42,574 $ 42,972