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Income Tax - Components of income tax expense benefit - (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Currently payable    
Federal $ 407us-gaap_CurrentFederalTaxExpenseBenefit $ 1,286us-gaap_CurrentFederalTaxExpenseBenefit
State 95us-gaap_CurrentStateAndLocalTaxExpenseBenefit 204us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred    
Federal 836us-gaap_DeferredFederalIncomeTaxExpenseBenefit (40)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 106us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 8us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total income tax expense $ 1,444us-gaap_IncomeTaxExpenseBenefit $ 1,458us-gaap_IncomeTaxExpenseBenefit