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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 3,565  
Due after one year through five years, Amortized Cost, Held-to-maturity 52,525  
Due after five years through ten years, Amortized Cost, Held-to-maturity 317,491  
Due after ten years, Amortized Cost, Held-to-maturity 2,081,005  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,454,586  
Due in one year or less, Fair Value, Held-to-maturity 3,554  
Due after one year through five years, Fair Value, Held-to-maturity 50,505  
Due after five years through ten years, Fair Value, Held-to-maturity 280,289  
Due after ten years, Fair Value, Held-to-maturity 1,709,683  
Total, Held-to-maturity, Fair Value 2,044,031  
Due in one year or less, Amortized Cost, Available-for-sale 36,409  
Due after one year through five years, Amortized Cost, Available-for-sale 264,422  
Due after five years through ten years, Amortized Cost, Available-for-sale 2,519,475  
Due after ten years, Amortized Cost, Available-for-sale 513,297  
Amortized Cost, Available-for-sale 3,333,603 $ 3,398,942
Due in one year or less, Fair Value, Available-for-sale 36,328  
Due after one year through five years, Fair Value, Available-for-sale 241,797  
Due after five years through ten years, Fair Value, Available-for-sale 2,164,588  
Due after ten years, Fair Value, Available-for-sale 394,387  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,837,100 $ 2,956,125