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Other Intangible Assets (Carrying and Fair Value of MSRs) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net carrying value, fair value of MSRs and loans Corporation servicing for others
Total other intangible assets	$ 15,388	$ 11,472
Mortgage servicing rights [Member]
Net carrying value, fair value of MSRs and loans Corporation servicing for others
Total other intangible assets	3,478	3,593	3,782	3,077
Fair value of MSRs	4,716	4,757
Loans serviced for others that have servicing rights capitalized	$ 906,314	$ 902,812

Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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