Mortgage Servicing Rights (Key assumptions) (Details 4) - Mortgage Servicing Rights |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2016 |
Dec. 31, 2015 |
|
| Key data and assumptions used in estimating the fair value of mortgage servicing rights | ||
| Weighted-Average Constant Prepayment Rate (as a percent) | 12.84% | 9.10% |
| Weighted-Average Life (in years) | 5 years 6 months 22 days | 7 years 4 months 26 days |
| Weighted-Average Note Rate (as a percent) | 4.15% | 4.23% |
| Weighted-Average Discount Rate (as a percent) | 9.00% | 9.38% |