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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Held-to-maturity, Amortized Cost    
Due after ten years $ 41,730  
Total held-to-maturity securities 329,507 $ 0
Held-to-maturity, Fair Value    
Due after ten years 41,729  
Held to maturity, fair value 329,503 0
Available for Sale, Amortized Cost    
Due in one year or less 5,614  
Due after one year through five years 20,250  
Due after five years through ten years 83,032  
Due after ten years 139,077  
Total 1,290,456 1,646,508
Available for Sale, Estimated Fair Value    
Due in one year or less 5,607  
Due after one year through five years 20,432  
Due after five years through ten years 78,488  
Due after ten years 124,879  
Available-for-sale debt securities, at fair value 1,199,482 1,631,699
Residential - U.S. Government-sponsored entities    
Held-to-maturity, Amortized Cost    
Mortgage-backed securities 287,777  
Held-to-maturity, Fair Value    
Mortgage-backed securities 287,774  
Held to maturity, fair value 287,774  
Available for Sale, Amortized Cost    
Mortgage-backed securities 926,988  
Total 926,988 1,213,910
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 858,198  
Available-for-sale debt securities, at fair value 858,198 1,198,816
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 11,088  
Total 11,088 11,942
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 10,908  
Available-for-sale debt securities, at fair value 10,908 12,213
Commercial - U.S. Government-sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 63,074  
Total 63,074 66,287
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 59,358  
Available-for-sale debt securities, at fair value 59,358 65,849
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 41,333  
Total 41,333 41,328
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 41,612  
Available-for-sale debt securities, at fair value $ 41,612 $ 42,013