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Mortgage Servicing Rights (Sensitivity Analysis of Current Fair Value to Changes in Discount and Prepayment Speed Assumptions) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Transfers and Servicing [Abstract]
Effect on fair value of a 10% adverse change	$ (1,733)	$ (1,445)
Effect on fair value of a 20% adverse change	(3,295)	(2,754)
Effect on fair value of a 100 basis point adverse change	(1,008)	(889)
Effect on fair value of a 200 basis point adverse change	$ (1,957)	$ (1,720)

The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References+ Details

- Definition

The hypothetical financial impact of a 20 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References+ Details