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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
May 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Held-to-maturity, Amortized Cost        
Due after ten years $ 41,769      
Total held-to-maturity securities 663,365     $ 0
Held-to-maturity, Fair Value        
Due after ten years 38,914      
Held to maturity, fair value 635,565 $ 343,700 $ 329,500 0
Available for Sale, Amortized Cost        
Due in one year or less 5,696      
Due after one year through five years 20,068      
Due after five years through ten years 81,722      
Due after ten years 137,537      
Total 882,773     1,646,508
Available for Sale, Estimated Fair Value        
Due in one year or less 5,702      
Due after one year through five years 20,062      
Due after five years through ten years 74,303      
Due after ten years 109,875      
Available-for-sale debt securities, at fair value 787,373     1,631,699
Residential - U.S. Government-sponsored entities        
Held-to-maturity, Amortized Cost        
Mortgage-backed securities 621,596      
Held-to-maturity, Fair Value        
Mortgage-backed securities 596,651      
Held to maturity, fair value 596,651      
Available for Sale, Amortized Cost        
Mortgage-backed securities 525,996      
Total 525,996     1,213,910
Available for Sale, Estimated Fair Value        
Mortgage-backed securities 472,096      
Available-for-sale debt securities, at fair value 472,096     1,198,816
Residential - Non-government agencies        
Available for Sale, Amortized Cost        
Mortgage-backed securities 10,499      
Total 10,499     11,942
Available for Sale, Estimated Fair Value        
Mortgage-backed securities 9,883      
Available-for-sale debt securities, at fair value 9,883     12,213
Commercial - U.S. Government-sponsored entities        
Available for Sale, Amortized Cost        
Mortgage-backed securities 59,918      
Total 59,918     66,287
Available for Sale, Estimated Fair Value        
Mortgage-backed securities 54,162      
Available-for-sale debt securities, at fair value 54,162     65,849
Commercial - Non-government agencies        
Available for Sale, Amortized Cost        
Mortgage-backed securities 41,337      
Total 41,337     41,328
Available for Sale, Estimated Fair Value        
Mortgage-backed securities 41,290      
Available-for-sale debt securities, at fair value $ 41,290     $ 42,013