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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, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 2,842  
Due after one year through five years, Amortized Cost, Held-to-maturity 645,420  
Due after five years through ten years, Amortized Cost, Held-to-maturity 694,667  
Due after ten years, Amortized Cost, Held-to-maturity 1,214,993  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,557,922  
Due in one year or less, Fair Value, Held-to-maturity 2,823  
Due after one year through five years, Fair Value, Held-to-maturity 568,453  
Due after five years through ten years, Fair Value, Held-to-maturity 595,729  
Due after ten years, Fair Value, Held-to-maturity 983,983  
Total, Held-to-maturity, Fair Value 2,150,988  
Due in one year or less, Amortized Cost, Available-for-sale 19,914  
Due after one year through five years, Amortized Cost, Available-for-sale 892,491  
Due after five years through ten years, Amortized Cost, Available-for-sale 2,610,587  
Due after ten years, Amortized Cost, Available-for-sale 339,224  
Amortized Cost, Available-for-sale 3,862,216 $ 3,185,249
Due in one year or less, Fair Value, Available-for-sale 19,404  
Due after one year through five years, Fair Value, Available-for-sale 809,644  
Due after five years through ten years, Fair Value, Available-for-sale 2,213,671  
Due after ten years, Fair Value, Available-for-sale 279,105  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 3,321,824 $ 3,183,923