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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, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 9,188  
Due after one year through five years, Amortized Cost, Held-to-maturity 628,543  
Due after five years through ten years, Amortized Cost, Held-to-maturity 537,429  
Due after ten years, Amortized Cost, Held-to-maturity 1,187,581  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,362,741  
Due in one year or less, Fair Value, Held-to-maturity 9,044  
Due after one year through five years, Fair Value, Held-to-maturity 601,064  
Due after five years through ten years, Fair Value, Held-to-maturity 503,542  
Due after ten years, Fair Value, Held-to-maturity 1,089,494  
Total, Held-to-maturity, Fair Value 2,203,144  
Due in one year or less, Amortized Cost, Available-for-sale 14,945  
Due after one year through five years, Amortized Cost, Available-for-sale 1,270,685  
Due after five years through ten years, Amortized Cost, Available-for-sale 1,904,250  
Due after ten years, Amortized Cost, Available-for-sale 660,844  
Amortized Cost, Available-for-sale 3,850,724 $ 3,185,249
Due in one year or less, Fair Value, Available-for-sale 14,963  
Due after one year through five years, Fair Value, Available-for-sale 1,220,048  
Due after five years through ten years, Fair Value, Available-for-sale 1,782,675  
Due after ten years, Fair Value, Available-for-sale 629,644  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 3,647,330 $ 3,183,923