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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 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 295,758  
Due after five years through ten years, Amortized Cost, Held-to-maturity 236,734  
Due after ten years, Amortized Cost, Held-to-maturity 346,461  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 878,953  
Due in one year or less, Fair Value, Held-to-maturity 0  
Due after one year through five years, Fair Value, Held-to-maturity 298,986  
Due after five years through ten years, Fair Value, Held-to-maturity 240,043  
Due after ten years, Fair Value, Held-to-maturity 354,677  
Total, Held-to-maturity, Fair Value 893,706  
Due in one year or less, Amortized Cost, Available-for-sale 12,709  
Due after one year through five years, Amortized Cost, Available-for-sale 1,845,451  
Due after five years through ten years, Amortized Cost, Available-for-sale 98,086  
Due after ten years, Amortized Cost, Available-for-sale 209,305  
Amortized Cost, Available-for-sale 2,165,551 $ 2,337,715
Due in one year or less, Fair Value, Available-for-sale 12,877  
Due after one year through five years, Fair Value, Available-for-sale 1,898,916  
Due after five years through ten years, Fair Value, Available-for-sale 100,634  
Due after ten years, Fair Value, Available-for-sale 215,124  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,227,551 $ 2,368,646