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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost    
Due in one year $ 32,699  
Due after one year through five years 148,616  
Due after five years through ten years 420,159  
Due after ten years 2,196,842  
Amortized Cost 2,798,316 $ 2,208,330
Estimated Fair Value    
Due in one year 31,842  
Due after one year through five years 142,018  
Due after five years through ten years 397,387  
Due after ten years 1,909,018  
Totals 2,480,265 2,207,938
Amortized Cost    
Due in one year 0  
Due after one year through five years 1,569  
Due after five years through ten years 15,377  
Due after ten years 151,092  
Totals 168,038 199,759
Estimated Fair Value    
Due in one year 0  
Due after one year through five years 1,548  
Due after five years through ten years 14,569  
Due after ten years 137,347  
Totals $ 153,464 $ 208,140