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Fair Value Measurements (Details 2) - Recurring - Significant Unobservable Inputs (Level 3) - Mortgage servicing rights
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Quantitative Information    
Weighted average constant prepayment rate (as a percent) 9.58% 10.54%
Weighted average discount rate (as a percent) 9.16% 9.21%
Weighted average expected life (in years) 5 years 10 months 24 days 5 years 8 months 12 days