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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity  
Due in one year or less Amortized Cost $ 74,855
Due after one year through five years Amortized Cost 1,834,793
Due after five years through ten years Amortized Cost 234,495
Due after ten years Amortized Cost 40,243
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 2,184,386
Due in one year or less , Fair Value 76,163
Due after one year through five years, Fair Value 1,889,321
Due after five years through ten years, Fair Value 250,032
Due after ten years, Fair Value 44,015
Available-for-sale Securities, Debt Maturities fair value $ 2,259,531
Due in one year or less, Weighted Average Yield 3.79%
Due after one year through five years, Weighted Average Yield 2.64%
Due after five years through ten years ,Weighted Average Yield 3.52%
Due after ten years, Weighted Average Yield 3.98%
Total available for sale Securities Debt Maturities, Weighted Average Yield 2.80%