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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, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 0  
Due after one year through five years, Amortized Cost, Held-to-maturity 339,132  
Due after five years through ten years, Amortized Cost, Held-to-maturity 140,143  
Due after ten years, Amortized Cost, Held-to-maturity 195,177  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 674,452  
Due in one year or less, Fair Value, Held-to-maturity 0  
Due after one year through five years, Fair Value, Held-to-maturity 338,758  
Due after five years through ten years, Fair Value, Held-to-maturity 141,903  
Due after ten years, Fair Value, Held-to-maturity 198,287  
Total, Held-to-maturity, Fair Value 678,948  
Due in one year or less, Amortized Cost, Available-for-sale 16,048  
Due after one year through five years, Amortized Cost, Available-for-sale 1,414,580  
Due after five years through ten years, Amortized Cost, Available-for-sale 266,108  
Due after ten years, Amortized Cost, Available-for-sale 21,621  
Amortized Cost, Available-for-sale 1,718,357 $ 1,757,666
Due in one year or less, Fair Value, Available-for-sale 16,175  
Due after one year through five years, Fair Value, Available-for-sale 1,435,647  
Due after five years through ten years, Fair Value, Available-for-sale 266,349  
Due after ten years, Fair Value, Available-for-sale 22,086  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 1,740,257 $ 1,734,085