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Capital Actions - Additional Information (Detail) (4.90% fixed-to-floating non-cumulative Series J perpetual preferred stock, USD $)	Mar. 31, 2015	Dec. 31, 2014
4.90% fixed-to-floating non-cumulative Series J perpetual preferred stock
Capital Actions
Preferred stock, issued	12,000	12,000
Preferred stock, liquidation preference	$ 25,000	$ 25,000

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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