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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, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 500  
Due after one year through five years, Amortized Cost, Held-to-maturity 315,591  
Due after five years through ten years, Amortized Cost, Held-to-maturity 187,726  
Due after ten years, Amortized Cost, Held-to-maturity 224,296  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 728,113  
Due in one year or less, Fair Value, Held-to-maturity 503  
Due after one year through five years, Fair Value, Held-to-maturity 311,769  
Due after five years through ten years, Fair Value, Held-to-maturity 189,711  
Due after ten years, Fair Value, Held-to-maturity 227,049  
Total, Held-to-maturity, Fair Value 729,032  
Due in one year or less, Amortized Cost, Available-for-sale 14,715  
Due after one year through five years, Amortized Cost, Available-for-sale 1,427,215  
Due after five years through ten years, Amortized Cost, Available-for-sale 114,977  
Due after ten years, Amortized Cost, Available-for-sale 27,780  
Amortized Cost, Available-for-sale 1,584,687 $ 1,757,666
Due in one year or less, Fair Value, Available-for-sale 14,896  
Due after one year through five years, Fair Value, Available-for-sale 1,441,490  
Due after five years through ten years, Fair Value, Available-for-sale 115,535  
Due after ten years, Fair Value, Available-for-sale 28,099  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 1,600,020 $ 1,734,085