Fair Value (Details 1) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Impaired loans
Total impaired loans	$ 0	$ 4,604
Mortgage servicing rights	539	534
Real estate held for sale
Total real estate held for sale	705	227
Commercial Real Estate [Member]
Impaired loans
Total impaired loans	0	1,787
Real estate held for sale
Total real estate held for sale	705	227
Commercial [Member]
Impaired loans
Total impaired loans	0	2,817
Fair Value, Inputs, Level 1 [Member]
Impaired loans
Total impaired loans	0	0
Mortgage servicing rights	0	0
Real estate held for sale
Total real estate held for sale	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial Real Estate [Member]
Impaired loans
Total impaired loans	0	0
Real estate held for sale
Total real estate held for sale	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial [Member]
Impaired loans
Total impaired loans	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans
Total impaired loans	0	0
Mortgage servicing rights	539	534
Real estate held for sale
Total real estate held for sale	0	0
Fair Value, Inputs, Level 2 [Member] | Commercial Real Estate [Member]
Impaired loans
Total impaired loans	0	0
Real estate held for sale
Total real estate held for sale	0	0
Fair Value, Inputs, Level 2 [Member] | Commercial [Member]
Impaired loans
Total impaired loans	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans
Total impaired loans	0	4,604
Mortgage servicing rights	0	0
Real estate held for sale
Total real estate held for sale	705	227
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate [Member]
Impaired loans
Total impaired loans	0	1,787
Real estate held for sale
Total real estate held for sale	705	227
Fair Value, Inputs, Level 3 [Member] | Commercial [Member]
Impaired loans
Total impaired loans	$ 0	$ 2,817