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Disclosures About Fair Value of Assets and Liabilities (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Impaired loans [Member] | Level 1 [Member]    
Fair value measurements of assets measured at fair value on a non-recurring basis    
Assets, Fair value, Nonrecurring
Impaired loans [Member]    
Fair value measurements of assets measured at fair value on a non-recurring basis    
Assets, Fair value, Nonrecurring 982 786
Impaired loans [Member] | Level 2 [Member]    
Fair value measurements of assets measured at fair value on a non-recurring basis    
Assets, Fair value, Nonrecurring
Impaired loans [Member] | Level 3 [Member]    
Fair value measurements of assets measured at fair value on a non-recurring basis    
Assets, Fair value, Nonrecurring 982 786
Mortgage Servicing Rights [Member] | Level 1 [Member]    
Fair value measurements of assets measured at fair value on a non-recurring basis    
Assets, Fair value, Nonrecurring
Mortgage Servicing Rights [Member]    
Fair value measurements of assets measured at fair value on a non-recurring basis    
Assets, Fair value, Nonrecurring 1,490 1,993
Mortgage Servicing Rights [Member] | Level 2 [Member]    
Fair value measurements of assets measured at fair value on a non-recurring basis    
Assets, Fair value, Nonrecurring
Mortgage Servicing Rights [Member] | Level 3 [Member]    
Fair value measurements of assets measured at fair value on a non-recurring basis    
Assets, Fair value, Nonrecurring $ 1,490 $ 1,993