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Carrying Amounts and Fair Value of Financial Instruments (Significant unobservable inputs used in the fair value measurements) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Securities, Available For Sale $ 386,255,837 $ 384,973,906
Impaired Loans | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Measurements, Valuation Processes, Description Appraised Value  
Significant Unobservable Inputs Discount Rates/ Discounts to Appraised Values  
Foreclosed Assets | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Measurements, Valuation Processes, Description Appraised Value/Comparable Sales  
Significant Unobservable Inputs Discount Rates/ Discounts to Appraised Values  
Minimum | Impaired Loans | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant Unobservable Inputs, Percentage Range 7.00% 0.00%
Minimum | Foreclosed Assets | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant Unobservable Inputs, Percentage Range 16.00% 13.00%
Maximum | Impaired Loans | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant Unobservable Inputs, Percentage Range 97.00% 98.00%
Maximum | Foreclosed Assets | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant Unobservable Inputs, Percentage Range 100.00% 100.00%