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SECURITIES (Securities available for sale debt maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due in 1 year or less $ 22,124  
Due in 1 to 5 years 65,617  
Due in 5 to 10 years 49,120  
Due after 10 years 985,364  
Total debt securities 1,122,225  
Mortgage and asset-backed securities 5,086,217  
Equity securities with a readily determinable fair value 20,838  
Total investment securities 6,229,280  
Estimated Fair Value    
Due in 1 year or less 21,736  
Due in 1 to 5 years 63,728  
Due in 5 to 10 years 39,808  
Due after 10 years 778,846  
Estimated Fair Value 904,118  
Mortgage and asset-backed securities 4,557,731  
Equity securities with a readily determinable fair value 20,838 $ 20,314
Total investment securities $ 5,482,687