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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, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 1,360  
Due after one year through five years, Amortized Cost, Held-to-maturity 235,798  
Due after five years through ten years, Amortized Cost, Held-to-maturity 152,170  
Due after ten years, Amortized Cost, Held-to-maturity 647,596  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 1,036,924  
Due in one year or less, Fair Value, Held-to-maturity 1,365  
Due after one year through five years, Fair Value, Held-to-maturity 243,918  
Due after five years through ten years, Fair Value, Held-to-maturity 154,121  
Due after ten years, Fair Value, Held-to-maturity 656,119  
Total, Held-to-maturity, Fair Value 1,055,523  
Due in one year or less, Amortized Cost, Available-for-sale 39,963  
Due after one year through five years, Amortized Cost, Available-for-sale 1,718,199  
Due after five years through ten years, Amortized Cost, Available-for-sale 1,045,295  
Due after ten years, Amortized Cost, Available-for-sale 105,289  
Amortized Cost, Available-for-sale 2,908,746 $ 2,344,174
Due in one year or less, Fair Value, Available-for-sale 40,364  
Due after one year through five years, Fair Value, Available-for-sale 1,744,873  
Due after five years through ten years, Fair Value, Available-for-sale 1,042,337  
Due after ten years, Fair Value, Available-for-sale 104,447  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,932,021 $ 2,398,923