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Investment Securities (Narrative) (Details Textual) (USD $) In Billions, unless otherwise specified	Mar. 31, 2013 securities	Dec. 31, 2012	Mar. 31, 2012
Investment Securities
Other investment securities pledged	$ 2.7	$ 1.6	$ 1.9
Percentage of investment that of fair value of investment portfolio	2.00%
Number of single issuer trust preferred securities with stated maturities	8

Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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