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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 2,730  
Due after one year through five years, Amortized Cost, Held-to-maturity 327,785  
Due after five years through ten years, Amortized Cost, Held-to-maturity 81,246  
Due after ten years, Amortized Cost, Held-to-maturity 165,933  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 577,694  
Due in one year or less, Fair Value, Held-to-maturity 2,764  
Due after one year through five years, Fair Value, Held-to-maturity 341,060  
Due after five years through ten years, Fair Value, Held-to-maturity 84,329  
Due after ten years, Fair Value, Held-to-maturity 175,369  
Total, Held-to-maturity, Fair Value 603,522  
Due in one year or less, Amortized Cost, Available-for-sale 27,816  
Due after one year through five years, Amortized Cost, Available-for-sale 1,960,912  
Due after five years through ten years, Amortized Cost, Available-for-sale 119,315  
Due after ten years, Amortized Cost, Available-for-sale 42,321  
Amortized Cost, Available-for-sale 2,150,364 $ 1,718,357
Due in one year or less, Fair Value, Available-for-sale 27,968  
Due after one year through five years, Fair Value, Available-for-sale 2,012,028  
Due after five years through ten years, Fair Value, Available-for-sale 121,652  
Due after ten years, Fair Value, Available-for-sale 43,998  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,205,646 $ 1,740,257