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Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012
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Available-for-sale Securities, Debt Maturities [Abstract] |
Due in one year or less Amortized Cost | $ 108,908
Due after one year through five years Amortized Cost | 1,921,408
Due after five years through ten years Amortized Cost | 235,086
Due after ten years Amortized Cost | 35,901
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis | 2,301,303
Due in one year or less , Fair Value | 110,725
Due after one year through five years, Fair Value | 1,970,933
Due after five years through ten years, Fair Value | 251,431
Due after ten years, Fair Value | 39,640
Available-for-sale Securities, Debt Maturities fair value | $ 2,372,729
Due in one year or less, Weighted Average Yield | 3.60%
Due after one year through five years, Weighted Average Yield | 2.62%
Due after five years through ten years ,Weighted Average Yield | 3.79%
Due after ten years, Weighted Average Yield | 3.64%
Total available for sale Securities Debt Maturities, Weighted Average Yield | 2.80%

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