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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Available-for-Sale, Amortized Cost    
Due in one year $ 6,625  
Due after one year through five years 62,174  
Due after five years through ten years 239,924  
Due after ten years 1,850,985  
Amortized Cost 2,159,708 $ 2,384,325
Available-for-Sale, Estimated Fair Value    
Due in one year 6,421  
Due after one year through five years 60,553  
Due after five years through ten years 231,415  
Due after ten years 1,680,881  
Totals 1,979,270 2,152,504
Held-to-Maturity, Amortized Cost    
Due in one year 1,137  
Due after one year through five years 3,453  
Due after five years through ten years 87,693  
Due after ten years 24,976  
Totals 117,259 133,494
Held-to-Maturity, Estimated Fair Value    
Due in one year 1,143  
Due after one year through five years 3,361  
Due after five years through ten years 83,990  
Due after ten years 23,493  
Totals $ 111,987 $ 125,126