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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Available-for-sale $ 39,649  
Due in one year or less, Fair Value, Available-for-sale 38,038  
Due after one year through five years, Amortized Cost, Available-for-sale 172,936  
Due after one year through five years, Fair Value, Available-for-sale 169,039  
Due after five years through ten years, Amortized Cost, Available-for-sale 1,672,996  
Due after five years through ten years, Fair Value, Available-for-sale 1,466,221  
Due after ten years, Amortized Cost, Available-for-sale 1,016,784  
Due after ten years, Fair Value, Available-for-sale 906,099  
Amortized Cost, Available-for-sale 2,902,365 $ 2,997,047
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value 2,579,397 $ 2,542,115
Due in one year or less, Amortized Cost, Held-to-maturity 17,459  
Due after one year through five years, Amortized Cost, Held-to-maturity 47,510  
Due after five years through ten years, Amortized Cost, Held-to-maturity 317,445  
Due after ten years, Amortized Cost, Held-to-maturity 1,915,495  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,297,909  
Due in one year or less, Fair Value, Held-to-maturity 17,186  
Due after one year through five years, Fair Value, Held-to-maturity 46,956  
Due after five years through ten years, Fair Value, Held-to-maturity 286,256  
Due after ten years, Fair Value, Held-to-maturity 1,585,500  
Total, Held-to-maturity, Fair Value $ 1,935,898