Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Available-for-sale Securities, Debt Maturities [Abstract]
Due in one year or less Amortized Cost	$ 124,996
Due after one year through five years Amortized Cost	1,630,781
Due after five years through ten years Amortized Cost	321,947
Due after ten years Amortized Cost	52,305
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	2,130,029
Due in one year or less , Fair Value	127,168
Due after one year through five years, Fair Value	1,679,549
Due after five years through ten years, Fair Value	340,109
Due after ten years, Fair Value	54,700
Available-for-sale Securities, Debt Maturities fair value	$ 2,201,526
Due in one year or less, Weighted Average Yield	3.22%
Due after one year through five years, Weighted Average Yield	2.81%
Due after five years through ten years ,Weighted Average Yield	3.70%
Due after ten years, Weighted Average Yield	3.65%
Total available for sale Securities Debt Maturities, Weighted Average Yield	2.99%

Total available for sale securities debt maturities weighted average yield.

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Due after five years through ten years ,weighted average yield.

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Due after ten years weighted average yield.

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This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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This item represents the total of all debt securities grouped by maturity dates, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are classified neither as held-to-maturity nor trading securities.

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