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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, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 2,000  
Due after one year through five years, Amortized Cost, Held-to-maturity 41,895  
Due after five years through ten years, Amortized Cost, Held-to-maturity 263,552  
Due after ten years, Amortized Cost, Held-to-maturity 2,246,854  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,554,301  
Due in one year or less, Fair Value, Held-to-maturity 1,995  
Due after one year through five years, Fair Value, Held-to-maturity 40,245  
Due after five years through ten years, Fair Value, Held-to-maturity 234,866  
Due after ten years, Fair Value, Held-to-maturity 1,878,481  
Total, Held-to-maturity, Fair Value 2,155,587  
Due in one year or less, Amortized Cost, Available-for-sale 1,578  
Due after one year through five years, Amortized Cost, Available-for-sale 345,663  
Due after five years through ten years, Amortized Cost, Available-for-sale 1,643,898  
Due after ten years, Amortized Cost, Available-for-sale 1,764,158  
Amortized Cost, Available-for-sale 3,755,297 $ 3,185,249
Due in one year or less, Fair Value, Available-for-sale 1,583  
Due after one year through five years, Fair Value, Available-for-sale 330,565  
Due after five years through ten years, Fair Value, Available-for-sale 1,420,508  
Due after ten years, Fair Value, Available-for-sale 1,502,555  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 3,255,211 $ 3,183,923