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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Amortized cost    
Due in one year or less $ 15,837  
Due after one year through five years 51,093  
Due after five years through ten years 174,222  
Due after ten years 54,552  
Mortgage and asset-backed securities 2,459,569  
Amortized cost 2,755,273 $ 2,791,843
Fair value    
Due in one year or less 15,660  
Due after one year through five years 46,045  
Due after five years through ten years 142,045  
Due after ten years 41,804  
Mortgage and asset-backed securities 2,123,778  
Fair value $ 2,369,332 $ 2,363,687