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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, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 12,414  
Due after one year through five years, Amortized Cost, Held-to-maturity 34,306  
Due after five years through ten years, Amortized Cost, Held-to-maturity 323,267  
Due after ten years, Amortized Cost, Held-to-maturity 2,119,454  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,489,441  
Due in one year or less, Fair Value, Held-to-maturity 11,874  
Due after one year through five years, Fair Value, Held-to-maturity 32,206  
Due after five years through ten years, Fair Value, Held-to-maturity 273,094  
Due after ten years, Fair Value, Held-to-maturity 1,652,144  
Total, Held-to-maturity, Fair Value 1,969,318  
Due in one year or less, Amortized Cost, Available-for-sale 35,816  
Due after one year through five years, Amortized Cost, Available-for-sale 321,428  
Due after five years through ten years, Amortized Cost, Available-for-sale 2,403,432  
Due after ten years, Amortized Cost, Available-for-sale 765,779  
Amortized Cost, Available-for-sale 3,526,455 $ 3,755,297
Due in one year or less, Fair Value, Available-for-sale 35,794  
Due after one year through five years, Fair Value, Available-for-sale 278,310  
Due after five years through ten years, Fair Value, Available-for-sale 1,964,310  
Due after ten years, Fair Value, Available-for-sale 594,749  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,873,163 $ 3,255,211