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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 2,724  
Due after one year through five years, Amortized Cost, Held-to-maturity 305,248  
Due after five years through ten years, Amortized Cost, Held-to-maturity 75,561  
Due after ten years, Amortized Cost, Held-to-maturity 195,093  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 578,626  
Due in one year or less, Fair Value, Held-to-maturity 2,751  
Due after one year through five years, Fair Value, Held-to-maturity 317,994  
Due after five years through ten years, Fair Value, Held-to-maturity 79,295  
Due after ten years, Fair Value, Held-to-maturity 204,183  
Total, Held-to-maturity, Fair Value 604,223  
Due in one year or less, Amortized Cost, Available-for-sale 10,473  
Due after one year through five years, Amortized Cost, Available-for-sale 2,204,046  
Due after five years through ten years, Amortized Cost, Available-for-sale 92,729  
Due after ten years, Amortized Cost, Available-for-sale 36,926  
Amortized Cost, Available-for-sale 2,344,174 $ 1,718,357
Due in one year or less, Fair Value, Available-for-sale 10,499  
Due after one year through five years, Fair Value, Available-for-sale 2,255,300  
Due after five years through ten years, Fair Value, Available-for-sale 94,795  
Due after ten years, Fair Value, Available-for-sale 38,329  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,398,923 $ 1,740,257