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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, 2015
Dec. 31, 2014
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 153,226  
Due after five years through ten years, Amortized Cost, Held-to-maturity 376,604  
Due after ten years, Amortized Cost, Held-to-maturity 321,159  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 850,989  
Due in one year or less, Fair Value, Held-to-maturity 0  
Due after one year through five years, Fair Value, Held-to-maturity 153,004  
Due after five years through ten years, Fair Value, Held-to-maturity 376,113  
Due after ten years, Fair Value, Held-to-maturity 323,922  
Total, Held-to-maturity, Fair Value 853,039  
Due in one year or less, Amortized Cost, Available-for-sale 13,758  
Due after one year through five years, Amortized Cost, Available-for-sale 1,967,040  
Due after five years through ten years, Amortized Cost, Available-for-sale 129,268  
Due after ten years, Amortized Cost, Available-for-sale 227,649  
Amortized Cost, Available-for-sale 2,337,715 $ 3,083,582
Due in one year or less, Fair Value, Available-for-sale 13,980  
Due after one year through five years, Fair Value, Available-for-sale 1,993,960  
Due after five years through ten years, Fair Value, Available-for-sale 130,620  
Due after ten years, Fair Value, Available-for-sale 230,086  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,368,646 $ 3,137,158