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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, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 768  
Due after one year through five years, Amortized Cost, Held-to-maturity 358,973  
Due after five years through ten years, Amortized Cost, Held-to-maturity 103,004  
Due after ten years, Amortized Cost, Held-to-maturity 179,510  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 642,255  
Due in one year or less, Fair Value, Held-to-maturity 788  
Due after one year through five years, Fair Value, Held-to-maturity 367,734  
Due after five years through ten years, Fair Value, Held-to-maturity 104,787  
Due after ten years, Fair Value, Held-to-maturity 184,510  
Total, Held-to-maturity, Fair Value 657,819  
Due in one year or less, Amortized Cost, Available-for-sale 13,043  
Due after one year through five years, Amortized Cost, Available-for-sale 1,376,413  
Due after five years through ten years, Amortized Cost, Available-for-sale 176,690  
Due after ten years, Amortized Cost, Available-for-sale 55,090  
Amortized Cost, Available-for-sale 1,621,236 $ 1,718,357
Due in one year or less, Fair Value, Available-for-sale 13,160  
Due after one year through five years, Fair Value, Available-for-sale 1,427,373  
Due after five years through ten years, Fair Value, Available-for-sale 182,573  
Due after ten years, Fair Value, Available-for-sale 56,649  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 1,679,755 $ 1,740,257