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Fair Value Measurements (Details 3) (Recurring, Significant Unobservable Inputs (Level 3), Mortgage servicing rights)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights
   
Quantitative Information    
Weighted average constant prepayment rate (as a percent) 9.69% 16.02%
Weighted average discount rate (as a percent) 9.15% 8.05%
Weighted average expected life (in years) 6 years 4 years 3 months 18 days