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Fair Value Measurements (Details 3) (Mortgage servicing rights [Member], Fair Value, Measurements, Recurring [Member])	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Mortgage servicing rights [Member] \| Fair Value, Measurements, Recurring [Member]
Estimated Fair Value Of Mortgage Servicing Rights
Weighted-average prepayment speed (CPR)	12.00%	12.00%
Option adjusted spread, in basis points	826	844
Volatility	28.00%	29.00%

Estimated speed of prepayments of principal on financial assets. This is used as a key input and assumption in measuring the fair value of assets or liabilities that relate to a transferor's continuing involvement, if any, as of the date of the latest statement of financial position presented.

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