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Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 130,839
Due after one year through five years, Amortized Cost 1,914,879
Due after five years through ten years, Amortized Cost 572,574
Due after ten years, Amortized Cost 61,435
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 2,679,727
Due in one year or less, Fair Value 133,540
Due after one year through five years, Fair Value 1,924,890
Due after five years through ten years, Fair Value 546,387
Due after ten years, Fair Value 58,825
Available-for-sale Securities, Debt Maturities fair value $ 2,663,642
Due in one year or less, Weighted-Average Yield 2.73%
Due after one year through five years, Weighted-Average Yield 2.32%
Due after five years through ten years, Weighted-Average Yield 2.23%
Due after ten years, Weighted-Average Yield 3.44%
Total available for sale Securities Debt Maturities, Weighted-Average Yield 2.35%