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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
INVESTMENT SECURITIES    
Equity securities, at fair value $ 1,593 $ 1,351
Available for Sale, Amortized Cost    
Due in one year or less 15,505  
Due after one year through five years 26,208  
Due after five years through ten years 91,076  
Due after ten years 157,470  
Available-for-sale debt securities, at fair value 1,535,450 1,182,609
Total 1,539,488 1,156,031
Available for Sale, Estimated Fair Value    
Due in one year or less 15,574  
Due after one year through five years 27,030  
Due after five years through ten years 91,520  
Due after ten years 156,782  
Equity securities    
INVESTMENT SECURITIES    
Equity securities, at amortized cost 1,225 1,068
Equity securities, at fair value 1,593 1,351
Residential - U.S. Government-sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 1,118,545  
Available-for-sale debt securities, at fair value 1,111,763 778,826
Total 1,118,545 762,309
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 1,111,763  
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 76,120  
Available-for-sale debt securities, at fair value 76,756 87,469
Total 76,120 85,405
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 76,756  
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 13,241  
Available-for-sale debt securities, at fair value 13,655 23,423
Total 13,241 22,671
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 13,655  
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 41,323  
Available-for-sale debt securities, at fair value 42,370 42,972
Total 41,323 $ 41,309
Available for Sale, Estimated Fair Value    
Mortgage-backed securities $ 42,370