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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Amortized cost    
Due in one year or less $ 15,738  
Due after one year through five years 51,135  
Due after five years through ten years 174,223  
Due after ten years 54,547  
Mortgage and asset-backed securities 2,415,050  
Amortized cost 2,710,693 $ 2,791,843
Fair value    
Due in one year or less 15,556  
Due after one year through five years 45,765  
Due after five years through ten years 140,826  
Due after ten years 41,376  
Mortgage and asset-backed securities 2,040,890  
Fair value $ 2,284,413 $ 2,363,687