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Mortgage Servicing Rights (Details 1)	9 Months Ended	12 Months Ended
Mortgage Servicing Rights (Details 1)	Sep. 30, 2012	Dec. 31, 2011
Fixed [Member]
Assumption for Fair Value of MSRs
Weighted-average OAS	5.80%	2.80%
Weighted-average life, in years	3.52	3.78
Adjustable [Member]
Assumption for Fair Value of MSRs
Weighted-average OAS	8.79%	5.61%
Weighted-average life, in years	2.01	2.10

The weighted average life of securitized 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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