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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 20,556  
Due after one year through five years, Amortized Cost, Held-to-maturity 44,550  
Due after five years through ten years, Amortized Cost, Held-to-maturity 318,541  
Due after ten years, Amortized Cost, Held-to-maturity 1,996,021  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,379,668  
Due in one year or less, Fair Value, Held-to-maturity 19,897  
Due after one year through five years, Fair Value, Held-to-maturity 43,049  
Due after five years through ten years, Fair Value, Held-to-maturity 277,213  
Due after ten years, Fair Value, Held-to-maturity 1,614,186  
Total, Held-to-maturity, Fair Value 1,954,345  
Due in one year or less, Amortized Cost, Available-for-sale 43,237  
Due after one year through five years, Amortized Cost, Available-for-sale 159,911  
Due after five years through ten years, Amortized Cost, Available-for-sale 1,937,667  
Due after ten years, Amortized Cost, Available-for-sale 856,232  
Amortized Cost, Available-for-sale 2,997,047 $ 3,398,942
Due in one year or less, Fair Value, Available-for-sale 43,205  
Due after one year through five years, Fair Value, Available-for-sale 136,474  
Due after five years through ten years, Fair Value, Available-for-sale 1,629,085  
Due after ten years, Fair Value, Available-for-sale 733,351  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,542,115 $ 2,956,125