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Fair Value Measurements (Details 2) - Recurring - Significant Unobservable Inputs (Level 3) - Mortgage servicing rights
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Quantitative Information    
Weighted average constant prepayment rate 9.07% 8.29%
Weighted average note rate (as a percent) 3.87% 3.85%
Weighted average discount rate 10.39% 9.72%
Weighted average expected life (in years) 6 years 2 months 12 days 6 years 6 months
Valuation Technique Discounted cash flows Discounted cash flows