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Fair Value Measurements (Details 2) (Level 3 [Member], Mortgage servicing rights [Member])
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Level 3 [Member] | Mortgage servicing rights [Member]
   
Quantitative Information about Level 3 Fair Value Measurements    
Weighted average constant prepayment rate 18.60% 20.86%
Weighted average discount rate 7.99% 7.99%