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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year $ 91,262  
Due after one year through five years 75,911  
Due after five years through ten years 406,088  
Due after ten years 2,019,914  
Amortized Cost 2,593,175 $ 2,742,987
Estimated Fair Value    
Due in one year 88,777  
Due after one year through five years 72,601  
Due after five years through ten years 385,442  
Due after ten years 1,773,593  
Totals 2,320,413 2,452,438
Amortized Cost    
Due in one year 0  
Due after one year through five years 6,790  
Due after five years through ten years 30,471  
Due after ten years 107,856  
Totals 145,117 160,983
Estimated Fair Value    
Due in one year 0  
Due after one year through five years 6,485  
Due after five years through ten years 27,882  
Due after ten years 100,042  
Totals $ 134,409 $ 149,938