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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, 2016
Dec. 31, 2015
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 355,263  
Due after five years through ten years, Amortized Cost, Held-to-maturity 200,570  
Due after ten years, Amortized Cost, Held-to-maturity 355,843  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 911,676  
Due in one year or less, Fair Value, Held-to-maturity 0  
Due after one year through five years, Fair Value, Held-to-maturity 349,455  
Due after five years through ten years, Fair Value, Held-to-maturity 196,869  
Due after ten years, Fair Value, Held-to-maturity 351,050  
Total, Held-to-maturity, Fair Value 897,374  
Due in one year or less, Amortized Cost, Available-for-sale 16,863  
Due after one year through five years, Amortized Cost, Available-for-sale 1,974,483  
Due after five years through ten years, Amortized Cost, Available-for-sale 87,968  
Due after ten years, Amortized Cost, Available-for-sale 176,560  
Amortized Cost, Available-for-sale 2,255,874 $ 2,337,715
Due in one year or less, Fair Value, Available-for-sale 17,004  
Due after one year through five years, Fair Value, Available-for-sale 1,986,171  
Due after five years through ten years, Fair Value, Available-for-sale 88,907  
Due after ten years, Fair Value, Available-for-sale 178,384  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,270,466 $ 2,368,646