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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, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 5,586  
Due after one year through five years, Amortized Cost, Held-to-maturity 402,803  
Due after five years through ten years, Amortized Cost, Held-to-maturity 901,078  
Due after ten years, Amortized Cost, Held-to-maturity 616,503  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 1,925,970  
Due in one year or less, Fair Value, Held-to-maturity 5,701  
Due after one year through five years, Fair Value, Held-to-maturity 405,175  
Due after five years through ten years, Fair Value, Held-to-maturity 893,932  
Due after ten years, Fair Value, Held-to-maturity 616,885  
Total, Held-to-maturity, Fair Value 1,921,693  
Due in one year or less, Amortized Cost, Available-for-sale 18,887  
Due after one year through five years, Amortized Cost, Available-for-sale 1,731,066  
Due after five years through ten years, Amortized Cost, Available-for-sale 1,079,941  
Due after ten years, Amortized Cost, Available-for-sale 355,355  
Amortized Cost, Available-for-sale 3,185,249 $ 2,344,174
Due in one year or less, Fair Value, Available-for-sale 19,073  
Due after one year through five years, Fair Value, Available-for-sale 1,744,199  
Due after five years through ten years, Fair Value, Available-for-sale 1,074,606  
Due after ten years, Fair Value, Available-for-sale 346,045  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 3,183,923 $ 2,398,923