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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 10,613  
Due after one year through five years, Amortized Cost, Held-to-maturity 48,043  
Due after five years through ten years, Amortized Cost, Held-to-maturity 323,158  
Due after ten years, Amortized Cost, Held-to-maturity 2,048,072  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,429,886  
Due in one year or less, Fair Value, Held-to-maturity 10,341  
Due after one year through five years, Fair Value, Held-to-maturity 45,765  
Due after five years through ten years, Fair Value, Held-to-maturity 280,962  
Due after ten years, Fair Value, Held-to-maturity 1,669,022  
Total, Held-to-maturity, Fair Value 2,006,090  
Due in one year or less, Amortized Cost, Available-for-sale 43,972  
Due after one year through five years, Amortized Cost, Available-for-sale 240,902  
Due after five years through ten years, Amortized Cost, Available-for-sale 2,470,052  
Due after ten years, Amortized Cost, Available-for-sale 492,502  
Amortized Cost, Available-for-sale 3,247,428 $ 3,398,942
Due in one year or less, Fair Value, Available-for-sale 43,677  
Due after one year through five years, Fair Value, Available-for-sale 216,478  
Due after five years through ten years, Fair Value, Available-for-sale 2,114,826  
Due after ten years, Fair Value, Available-for-sale 370,815  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,745,796 $ 2,956,125