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Fair Value (Details Textual) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Valuation allowance for impaired loans $ 1,228 $ 1,911  
Provision for impaired loan losses (221)   $ (1,200)
Other real estate owned 3,382 3,965  
Commercial Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value 2,800 3,000  
Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value 600 1,000  
State and Municipal Obligation [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value $ 4,725 $ 5,900  
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 $ 3,033 $ 11,477  
Valuation allowance for impaired loans $ 1,200 $ 1,900  
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 $ 700 $ 1,100  
Other Real Estate | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value 3,382 3,965  
Other real estate owned $ 3,400 $ 4,000  
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%