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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, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 12,935  
Due after one year through five years, Amortized Cost, Held-to-maturity 36,466  
Due after five years through ten years, Amortized Cost, Held-to-maturity 321,288  
Due after ten years, Amortized Cost, Held-to-maturity 2,093,921  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,464,610  
Due in one year or less, Fair Value, Held-to-maturity 12,577  
Due after one year through five years, Fair Value, Held-to-maturity 35,528  
Due after five years through ten years, Fair Value, Held-to-maturity 287,284  
Due after ten years, Fair Value, Held-to-maturity 1,747,492  
Total, Held-to-maturity, Fair Value 2,082,881  
Due in one year or less, Amortized Cost, Available-for-sale 34,448  
Due after one year through five years, Amortized Cost, Available-for-sale 268,224  
Due after five years through ten years, Amortized Cost, Available-for-sale 2,528,106  
Due after ten years, Amortized Cost, Available-for-sale 568,164  
Amortized Cost, Available-for-sale 3,398,942 $ 3,755,297
Due in one year or less, Fair Value, Available-for-sale 34,448  
Due after one year through five years, Fair Value, Available-for-sale 264,349  
Due after five years through ten years, Fair Value, Available-for-sale 2,205,784  
Due after ten years, Fair Value, Available-for-sale 451,544  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,956,125 $ 3,255,211