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Premises and Equipment - Summary of Premises and Equipment (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Land 684,977us-gaap_Land $ 684,977us-gaap_Land $ 684,977us-gaap_Land
Buildings 6,221,980us-gaap_BuildingsAndImprovementsGross 6,142,509us-gaap_BuildingsAndImprovementsGross 6,083,675us-gaap_BuildingsAndImprovementsGross
Equipment and fixtures 5,400,514us-gaap_FixturesAndEquipmentGross 5,187,984us-gaap_FixturesAndEquipmentGross 5,126,477us-gaap_FixturesAndEquipmentGross
Construction in progress 53,197us-gaap_ConstructionInProgressGross 61,155us-gaap_ConstructionInProgressGross 4,150us-gaap_ConstructionInProgressGross
Property plant and equipment gross 12,360,668us-gaap_PropertyPlantAndEquipmentGross 12,076,625us-gaap_PropertyPlantAndEquipmentGross 11,899,279us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (8,689,373)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (8,379,853)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (8,026,277)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property plant and equipment net 3,671,295us-gaap_PropertyPlantAndEquipmentNet $ 3,696,772us-gaap_PropertyPlantAndEquipmentNet $ 3,873,002us-gaap_PropertyPlantAndEquipmentNet
Buildings | Minimum      
Property, Plant and Equipment [Line Items]      
Useful lives 5 years    
Buildings | Maximum      
Property, Plant and Equipment [Line Items]      
Useful lives 50 years    
Equipment and fixtures | Minimum      
Property, Plant and Equipment [Line Items]      
Useful lives 5 years    
Equipment and fixtures | Maximum      
Property, Plant and Equipment [Line Items]      
Useful lives 30 years