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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, 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 264,136  
Due after five years through ten years, Amortized Cost, Held-to-maturity 232,213  
Due after ten years, Amortized Cost, Held-to-maturity 236,615  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 733,464  
Due in one year or less, Fair Value, Held-to-maturity 506  
Due after one year through five years, Fair Value, Held-to-maturity 254,886  
Due after five years through ten years, Fair Value, Held-to-maturity 231,964  
Due after ten years, Fair Value, Held-to-maturity 233,295  
Total, Held-to-maturity, Fair Value 720,651  
Due in one year or less, Amortized Cost, Available-for-sale 11,947  
Due after one year through five years, Amortized Cost, Available-for-sale 1,481,462  
Due after five years through ten years, Amortized Cost, Available-for-sale 157,640  
Due after ten years, Amortized Cost, Available-for-sale 26,683  
Amortized Cost, Available-for-sale 1,677,732 $ 1,757,666
Due in one year or less, Fair Value, Available-for-sale 12,113  
Due after one year through five years, Fair Value, Available-for-sale 1,479,161  
Due after five years through ten years, Fair Value, Available-for-sale 155,816  
Due after ten years, Fair Value, Available-for-sale 26,411  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 1,673,501 $ 1,734,085