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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 22,354  
Due after one year through five years, Amortized Cost, Held-to-maturity 47,513  
Due after five years through ten years, Amortized Cost, Held-to-maturity 320,024  
Due after ten years, Amortized Cost, Held-to-maturity 1,969,250  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,359,141  
Due in one year or less, Fair Value, Held-to-maturity 21,879  
Due after one year through five years, Fair Value, Held-to-maturity 46,017  
Due after five years through ten years, Fair Value, Held-to-maturity 282,325  
Due after ten years, Fair Value, Held-to-maturity 1,614,867  
Total, Held-to-maturity, Fair Value 1,965,088  
Due in one year or less, Amortized Cost, Available-for-sale 42,417  
Due after one year through five years, Amortized Cost, Available-for-sale 145,113  
Due after five years through ten years, Amortized Cost, Available-for-sale 1,894,064  
Due after ten years, Amortized Cost, Available-for-sale 840,810  
Amortized Cost, Available-for-sale 2,922,404 $ 2,997,047
Due in one year or less, Fair Value, Available-for-sale 42,370  
Due after one year through five years, Fair Value, Available-for-sale 132,724  
Due after five years through ten years, Fair Value, Available-for-sale 1,633,571  
Due after ten years, Fair Value, Available-for-sale 726,401  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,535,066 $ 2,542,115