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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, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 11,608  
Due after one year through five years, Amortized Cost, Held-to-maturity 35,679  
Due after five years through ten years, Amortized Cost, Held-to-maturity 299,200  
Due after ten years, Amortized Cost, Held-to-maturity 2,189,492  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,535,979  
Due in one year or less, Fair Value, Held-to-maturity 11,147  
Due after one year through five years, Fair Value, Held-to-maturity 34,823  
Due after five years through ten years, Fair Value, Held-to-maturity 270,717  
Due after ten years, Fair Value, Held-to-maturity 1,851,882  
Total, Held-to-maturity, Fair Value 2,168,569  
Due in one year or less, Amortized Cost, Available-for-sale 1,495  
Due after one year through five years, Amortized Cost, Available-for-sale 327,651  
Due after five years through ten years, Amortized Cost, Available-for-sale 1,945,392  
Due after ten years, Amortized Cost, Available-for-sale 1,389,646  
Amortized Cost, Available-for-sale 3,664,184 $ 3,755,297
Due in one year or less, Fair Value, Available-for-sale 1,500  
Due after one year through five years, Fair Value, Available-for-sale 314,059  
Due after five years through ten years, Fair Value, Available-for-sale 1,688,229  
Due after ten years, Fair Value, Available-for-sale 1,200,736  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 3,204,524 $ 3,255,211