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Intangible Assets (Details 1) - Mortgage servicing rights (MSRs)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Assumptions used in estimating the fair value of mortgage service rights    
Weighted average constant prepayment rate 9.36% 10.11%
Weighted average note rate 3.92% 3.86%
Weighted average discount rate 10.36% 9.78%
Weighted average expected life (in years) 6 years 1 month 6 days 5 years 9 months 18 days