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Intangible Assets (Details 1) - Mortgage servicing rights (MSRs)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Assumptions used in estimating the fair value of mortgage service rights    
Weighted-Average Constant Prepayment Rate 9.73% 10.68%
Weighted-Average Note Rate 3.85% 3.85%
Weighted-Average Discount Rate 10.09% 9.69%
Weighted-Average Expected Life (in years) 5 years 10 months 24 days 5 years 7 months 6 days