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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Available-for-Sale, Amortized Cost    
Due in one year $ 6,846  
Due after one year through five years 54,833  
Due after five years through ten years 163,284  
Due after ten years 1,779,901  
Amortized Cost 2,004,864 $ 2,138,533
Available-for-Sale, Estimated Fair Value    
Due in one year 6,808  
Due after one year through five years 53,091  
Due after five years through ten years 152,467  
Due after ten years 1,603,010  
Totals 1,815,376 1,904,885
Held-to-Maturity, Amortized Cost    
Due in one year 1,168  
Due after one year through five years 2,334  
Due after five years through ten years 97,202  
Due after ten years 968  
Totals 101,672 111,866
Held-to-Maturity, Estimated Fair Value    
Due in one year 1,169  
Due after one year through five years 2,282  
Due after five years through ten years 92,601  
Due after ten years 921  
Totals $ 96,973 $ 104,349