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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Available-for-Sale, Amortized Cost    
Due in one year $ 117  
Due after one year through five years 62,087  
Due after five years through ten years 158,524  
Due after ten years 1,686,233  
Amortized Cost 1,906,961 $ 2,138,533
Available-for-Sale, Estimated Fair Value    
Due in one year 117  
Due after one year through five years 60,420  
Due after five years through ten years 148,757  
Due after ten years 1,531,462  
Totals 1,740,756 1,904,885
Held-to-Maturity, Amortized Cost    
Due in one year 0  
Due after one year through five years 2,511  
Due after five years through ten years 91,981  
Due after ten years 954  
Totals 95,446 111,866
Held-to-Maturity, Estimated Fair Value    
Due in one year 0  
Due after one year through five years 2,475  
Due after five years through ten years 87,905  
Due after ten years 919  
Totals $ 91,299 $ 104,349