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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
May 31, 2022
Dec. 31, 2021
Held-to-maturity, Amortized Cost        
Due after ten years $ 41,808      
Total held-to-maturity securities 662,827     $ 0
Held-to-maturity, Fair Value        
Due after ten years 36,129      
Held to maturity, fair value 590,880 $ 329,500 $ 343,700 0
Available for Sale, Amortized Cost        
Due in one year or less 6,016      
Due after one year through five years 19,268      
Due after five years through ten years 80,816      
Due after ten years 136,023      
Total 819,936     1,646,508
Available for Sale, Estimated Fair Value        
Due in one year or less 5,992      
Due after one year through five years 18,786      
Due after five years through ten years 70,528      
Due after ten years 101,176      
Available-for-sale debt securities, at fair value 686,681     1,631,699
Residential - U.S. Government-sponsored entities        
Held-to-maturity, Amortized Cost        
Mortgage-backed securities 621,019      
Held-to-maturity, Fair Value        
Mortgage-backed securities 554,751      
Held to maturity, fair value 554,751      
Available for Sale, Amortized Cost        
Mortgage-backed securities 511,171      
Total 511,171     1,213,910
Available for Sale, Estimated Fair Value        
Mortgage-backed securities 432,285      
Available-for-sale debt securities, at fair value 432,285     1,198,816
Residential - Non-government agencies        
Available for Sale, Amortized Cost        
Mortgage-backed securities 10,088      
Total 10,088     11,942
Available for Sale, Estimated Fair Value        
Mortgage-backed securities 8,933      
Available-for-sale debt securities, at fair value 8,933     12,213
Commercial - U.S. Government-sponsored entities        
Available for Sale, Amortized Cost        
Mortgage-backed securities 55,012      
Total 55,012     66,287
Available for Sale, Estimated Fair Value        
Mortgage-backed securities 47,462      
Available-for-sale debt securities, at fair value 47,462     65,849
Commercial - Non-government agencies        
Available for Sale, Amortized Cost        
Mortgage-backed securities 1,542      
Total 1,542     41,328
Available for Sale, Estimated Fair Value        
Mortgage-backed securities 1,519      
Available-for-sale debt securities, at fair value $ 1,519     $ 42,013