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Fair Value (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Valuation allowance for impaired loans $ 1,073 $ 1,159  
Provision for impaired loan losses (343)   $ (300)
Other real estate owned 2,850 3,466  
Commercial Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value 2,400 2,800  
Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value 500 700  
State and Municipal Obligation [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value $ 4,210 $ 4,725  
Fair Value Measurements, Valuation Techniques Discounted cash flow Discounted cash flow  
Fair Value Measurements Unobservable Inputs Discount rate Probability of default Discount rate Probability of default  
Impaired Loans | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value $ 1,387 $ 2,352  
Valuation allowance for impaired loans $ 1,100 $ 1,200  
Fair Value Measurements, Valuation Techniques Sales comparison/income approach Sales comparison/income approach  
Fair Value Measurements Unobservable Inputs Discount rate for age of appraisal and market conditions Discount rate for age of appraisal and market conditions  
Other Real Estate      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Real estate, other deductions $ 1,100 $ 700  
Other Real Estate | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value 2,850 3,466  
Other real estate owned $ 2,900 $ 3,500  
Fair Value Measurements, Valuation Techniques Sales comparison/income approach Sales comparison/income approach  
Fair Value Measurements Unobservable Inputs Discount rate for age of appraisal and market conditions Discount rate for age of appraisal and market conditions  
Minimum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value inputs, discount rate 0.00%    
Minimum [Member] | State and Municipal Obligation [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value inputs, discount rate 3.05% 3.05%  
Minimum [Member] | Impaired Loans | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value inputs, discount rate 0.00% 0.00%  
Minimum [Member] | Other Real Estate | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value inputs, discount rate 5.00% 5.00%  
Maximum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value inputs, discount rate 50.00%    
Maximum [Member] | State and Municipal Obligation [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value inputs, discount rate 5.50% 5.50%  
Maximum [Member] | Impaired Loans | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value inputs, discount rate 50.00% 50.00%  
Maximum [Member] | Other Real Estate | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value inputs, discount rate 20.00% 20.00%