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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Available-for-Sale, Amortized Cost    
Due in one year $ 6,847  
Due after one year through five years 51,271  
Due after five years through ten years 176,291  
Due after ten years 1,820,217  
Amortized Cost 2,054,626 $ 2,138,533
Available-for-Sale, Estimated Fair Value    
Due in one year 6,749  
Due after one year through five years 49,281  
Due after five years through ten years 165,236  
Due after ten years 1,631,084  
Totals 1,852,350 1,904,885
Held-to-Maturity, Amortized Cost    
Due in one year 1,158  
Due after one year through five years 2,694  
Due after five years through ten years 102,035  
Due after ten years 981  
Totals 106,868 111,866
Held-to-Maturity, Estimated Fair Value    
Due in one year 1,159  
Due after one year through five years 2,628  
Due after five years through ten years 96,297  
Due after ten years 932  
Totals $ 101,016 $ 104,349