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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, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 424  
Due after one year through five years, Amortized Cost, Held-to-maturity 165,814  
Due after five years through ten years, Amortized Cost, Held-to-maturity 312,610  
Due after ten years, Amortized Cost, Held-to-maturity 406,209  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 885,057  
Due in one year or less, Fair Value, Held-to-maturity 424  
Due after one year through five years, Fair Value, Held-to-maturity 162,958  
Due after five years through ten years, Fair Value, Held-to-maturity 308,128  
Due after ten years, Fair Value, Held-to-maturity 400,245  
Total, Held-to-maturity, Fair Value 871,755  
Due in one year or less, Amortized Cost, Available-for-sale 22,498  
Due after one year through five years, Amortized Cost, Available-for-sale 1,848,800  
Due after five years through ten years, Amortized Cost, Available-for-sale 327,338  
Due after ten years, Amortized Cost, Available-for-sale 57,268  
Amortized Cost, Available-for-sale 2,255,904 $ 2,255,874
Due in one year or less, Fair Value, Available-for-sale 22,719  
Due after one year through five years, Fair Value, Available-for-sale 1,867,464  
Due after five years through ten years, Fair Value, Available-for-sale 323,905  
Due after ten years, Fair Value, Available-for-sale 57,615  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,271,703 $ 2,270,466