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Securities - Carrying Value and Estimated Fair Value of Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]      
Total $ 5,651,768 $ 5,155,305 $ 5,030,124
Due within one year 225,746    
Due after one year through five years 2,493,891    
Due after five years through ten years 2,145,923    
Due after ten years 786,208    
Total 5,651,768    
Available-for-Sale, Estimated Fair Value, Due within one year 223,945    
Available-for-Sale, Estimated Fair Value, Due after one year through five years 2,383,120    
Available-for-Sale, Estimated Fair Value, Due after five years through ten years 1,966,228    
Available-for-Sale, Estimated Fair Value, Due after ten years 687,520    
Available-for-Sale, Estimated Fair Value, Total $ 5,260,813 $ 4,617,759 $ 4,612,299