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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, 2018
Dec. 31, 2017
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 283,278  
Due after five years through ten years, Amortized Cost, Held-to-maturity 209,623  
Due after ten years, Amortized Cost, Held-to-maturity 279,568  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 772,469  
Due in one year or less, Fair Value, Held-to-maturity 0  
Due after one year through five years, Fair Value, Held-to-maturity 270,230  
Due after five years through ten years, Fair Value, Held-to-maturity 205,138  
Due after ten years, Fair Value, Held-to-maturity 272,221  
Total, Held-to-maturity, Fair Value 747,589  
Due in one year or less, Amortized Cost, Available-for-sale 26,487  
Due after one year through five years, Amortized Cost, Available-for-sale 1,711,078  
Due after five years through ten years, Amortized Cost, Available-for-sale 197,590  
Due after ten years, Amortized Cost, Available-for-sale 29,096  
Amortized Cost, Available-for-sale 1,964,251 $ 2,078,131
Due in one year or less, Fair Value, Available-for-sale 26,762  
Due after one year through five years, Fair Value, Available-for-sale 1,682,200  
Due after five years through ten years, Fair Value, Available-for-sale 192,738  
Due after ten years, Fair Value, Available-for-sale 28,294  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 1,929,994 $ 2,080,985