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Intangible Assets (Details 1) - Mortgage servicing rights (MSRs)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Assumptions used in estimating the fair value of mortgage service rights    
Weighted average constant prepayment rate 9.55% 9.28%
Weighted average note rate 3.90% 3.86%
Weighted average discount rate 10.34% 9.75%
Weighted average expected life (in years) 6 years 1 month 6 days 6 years 1 month 6 days