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Intangible Assets (Carrying and Fair Value of MSRs) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Net carrying value, fair value of MSRs and loans Corporation servicing for others      
Loans serviced for others that have servicing rights capitalized $ 899,823 $ 906,314 $ 916,815
Mortgage servicing rights [Member]
     
Net carrying value, fair value of MSRs and loans Corporation servicing for others      
Net carrying value of MSRs 3,421 3,478 3,463
Fair value of MSRs $ 6,417 $ 4,716 $ 4,938