Fair Value Accounting (Details 1) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Impaired loans	$ 9,199	$ 8,769
Other real estate owned	242	242
Total assets measured at fair value on a nonrecurring basis	9,441	9,011
Level 1 [Member]
Assets
Impaired loans
Other real estate owned
Total assets measured at fair value on a nonrecurring basis
Level 2 [Member]
Assets
Impaired loans	2,083	2,685
Other real estate owned	148	148
Total assets measured at fair value on a nonrecurring basis	2,231	2,833
Level 3 [Member]
Assets
Impaired loans	7,116	6,084
Other real estate owned	94	94
Total assets measured at fair value on a nonrecurring basis	$ 7,210	$ 6,178