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Intangible Assets (Details 1) - Mortgage servicing rights (MSRs)
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Assumptions used in estimating the fair value of mortgage service rights    
Weighted average constant prepayment rate 9.28% 12.16%
Weighted average note rate 3.86% 3.90%
Weighted average discount rate 9.75% 9.19%
Weighted average expected life (in years) 6 years 1 month 6 days 5 years 1 month 6 days