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Disclosures about Fair Value Measurements and Financial Instruments (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans $ 926 $ 1,759
Fair Value Measurements, Nonrecurring Basis [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans 91 850
Other real estate owned 168 18
Fair Value Measurements, Nonrecurring Basis [Member] | Impaired Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans $ 91 $ 850
Valuation Techniques [1],[2] Appraisal of collateral Appraisal of collateral
Appraisal of Adjustment [3] 90.00% 54.00%
Fair Value Measurements, Nonrecurring Basis [Member] | Other Real Estate Owned [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other real estate owned $ 168 $ 18
Valuation Techniques [1],[2] Appraisal of collateral Appraisal of collateral
Appraisal of Adjustment [3] 2.00% 29.00%
Liquidation expenses 35.00% 79.00%
Fair Value Measurements, Nonrecurring Basis [Member] | Minimum [Member] | Impaired Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Appraisal of Adjustment [3] 0.00% 21.00%
Fair Value Measurements, Nonrecurring Basis [Member] | Minimum [Member] | Other Real Estate Owned [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Appraisal of Adjustment [3] 0.00% 16.00%
Liquidation expenses 0.00% 2.00%
Fair Value Measurements, Nonrecurring Basis [Member] | Maximum [Member] | Impaired Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Appraisal of Adjustment [3] 100.00% 75.00%
Fair Value Measurements, Nonrecurring Basis [Member] | Maximum [Member] | Other Real Estate Owned [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Appraisal of Adjustment [3] 25.00% 64.00%
Liquidation expenses 186.00% 206.00%
Fair Value Measurements, Nonrecurring Basis [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans $ 0 $ 0
Other real estate owned 0 0
Fair Value Measurements, Nonrecurring Basis [Member] | Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans 0 0
Other real estate owned 0 0
Fair Value Measurements, Nonrecurring Basis [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans 91 850
Other real estate owned $ 168 $ 18
[1] Fair Value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable.
[2] Includes qualitative adjustments by management and estimated liquidation expenses.
[3] Appraisals may be adjusted by management for qualitative factors such as economic conditions.