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INVESTMENT SECURITIES - Debt Maturities (Details) - Investment Securities - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Amortized Cost    
Due within one year $ 431,353  
Due after one year through five years 1,578,453  
Due after five years through ten years 2,375,052  
Due after ten years 780,704  
Available-for-sale, amortized cost 5,165,562 $ 5,060,135
Fair Value    
Due within one year 430,225  
Due after one year through five years 1,552,380  
Due after five years through ten years 2,260,716  
Due after ten years 764,466  
Total fair value $ 5,007,787 $ 4,918,931
Weighted- Average Yield    
Due within one year 2.32%  
Due after one year through five years 4.19%  
Due after five years through ten years 4.35%  
Due after ten years 5.70%  
Weighted-average yield 4.33%