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Summary of Significant Accounting Policies (Details Narrative) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Cash on deposit with Federal Reserve Bank 409cofs_CashReserveDepositFederalReserveBank $ 352cofs_CashReserveDepositFederalReserveBank
Unrealized gain on securities available for sale 924us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax  
Unrealized gain on post-retirement plans. 149us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Land improvements [Member] | Lower Range [Member]    
Property, Plant and Equipment [Line Items]    
Useful lives 7 years  
Land improvements [Member] | Upper Range [Member]    
Property, Plant and Equipment [Line Items]    
Useful lives 15 years  
Building [Member] | Lower Range [Member]    
Property, Plant and Equipment [Line Items]    
Useful lives 5 years  
Building [Member] | Upper Range [Member]    
Property, Plant and Equipment [Line Items]    
Useful lives 39 years  
Furniture and equipment [Member] | Lower Range [Member]    
Property, Plant and Equipment [Line Items]    
Useful lives 3 years  
Furniture and equipment [Member] | Upper Range [Member]    
Property, Plant and Equipment [Line Items]    
Useful lives 7 years