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Mortgage Servicing Rights (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Mortgage Servicing Rights
Unpaid principal balances of loans serviced for others	$ 1,440,000,000	$ 1,450,000,000
Mortgage servicing rights	6,947,000	8,136,000	9,204,000
Estimated Fair Value
Mortgage Servicing Rights
Mortgage servicing rights	$ 6,900,000	$ 8,100,000

This includes only the derecognized portion of the total principal amount of financial assets which have been either securitized, used in an asset-backed financing arrangement, or similar transfers which are accounted for as sales and in which the transferor has continuing involvement with the assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets).

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