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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 3,769  
Due after one year through five years, Amortized Cost, Held-to-maturity 270,074  
Due after five years through ten years, Amortized Cost, Held-to-maturity 798,605  
Due after ten years, Amortized Cost, Held-to-maturity 638,490  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 1,710,938  
Due in one year or less, Fair Value, Held-to-maturity 3,834  
Due after one year through five years, Fair Value, Held-to-maturity 276,504  
Due after five years through ten years, Fair Value, Held-to-maturity 798,051  
Due after ten years, Fair Value, Held-to-maturity 638,841  
Total, Held-to-maturity, Fair Value 1,717,230  
Due in one year or less, Amortized Cost, Available-for-sale 23,634  
Due after one year through five years, Amortized Cost, Available-for-sale 1,803,142  
Due after five years through ten years, Amortized Cost, Available-for-sale 721,776  
Due after ten years, Amortized Cost, Available-for-sale 367,748  
Amortized Cost, Available-for-sale 2,916,300 $ 2,344,174
Due in one year or less, Fair Value, Available-for-sale 23,919  
Due after one year through five years, Fair Value, Available-for-sale 1,820,712  
Due after five years through ten years, Fair Value, Available-for-sale 718,076  
Due after ten years, Fair Value, Available-for-sale 362,353  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,925,060 $ 2,398,923