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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year $ 6,847  
Due after one year through five years 68,151  
Due after five years through ten years 194,985  
Due after ten years 1,868,550  
Amortized Cost 2,138,533 $ 2,384,325
Estimated Fair Value    
Due in one year 6,690  
Due after one year through five years 64,940  
Due after five years through ten years 182,944  
Due after ten years 1,650,311  
Totals 1,904,885 2,152,504
Amortized Cost    
Due in one year 1,147  
Due after one year through five years 3,054  
Due after five years through ten years 89,254  
Due after ten years 18,411  
Amortized Cost 111,866 133,494
Estimated Fair Value    
Due in one year 1,149  
Due after one year through five years 2,965  
Due after five years through ten years 83,477  
Due after ten years 16,758  
Totals $ 104,349 $ 125,126