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Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 130,984
Due after one year through five years, Amortized Cost 1,895,032
Due after five years through ten years, Amortized Cost 527,503
Due after ten years, Amortized Cost 56,440
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 2,609,959
Due in one year or less, Fair Value 133,474
Due after one year through five years, Fair Value 1,919,812
Due after five years through ten years, Fair Value 508,724
Due after ten years, Fair Value 55,297
Available-for-sale Securities, Debt Maturities fair value $ 2,617,307
Due in one year or less, Weighted-Average Yield 2.39%
Due after one year through five years, Weighted-Average Yield 2.22%
Due after five years through ten years, Weighted-Average Yield 2.37%
Due after ten years, Weighted-Average Yield 3.49%
Total available for sale Securities Debt Maturities, Weighted-Average Yield 2.28%