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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year $ 83,239  
Due after one year through five years 47,769  
Due after five years through ten years 367,733  
Due after ten years 1,885,584  
Amortized Cost 2,384,325 $ 2,742,987
Estimated Fair Value    
Due in one year 81,775  
Due after one year through five years 44,932  
Due after five years through ten years 354,333  
Due after ten years 1,671,464  
Totals 2,152,504 2,452,438
Amortized Cost    
Due in one year 0  
Due after one year through five years 5,829  
Due after five years through ten years 89,070  
Due after ten years 38,595  
Amortized Cost 133,494 160,983
Estimated Fair Value    
Due in one year 0  
Due after one year through five years 5,640  
Due after five years through ten years 83,726  
Due after ten years 35,760  
Totals $ 125,126 $ 149,938