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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
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%