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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 60,691  
Due after one year through five years 81,268  
Due after five years through ten years 144,224  
Due after ten years 54,309  
Mortgage and asset-backed securities 2,231,466  
Amortized cost 2,571,958 $ 2,617,266
Fair value    
Due in one year or less 60,117  
Due after one year through five years 72,799  
Due after five years through ten years 117,497  
Due after ten years 41,202  
Mortgage and asset-backed securities 1,887,357  
Fair value $ 2,178,972 $ 2,237,001