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INCOME TAXES - Components of provision for income taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current provision:      
Federal $ 4,275us-gaap_CurrentFederalTaxExpenseBenefit $ 2,325us-gaap_CurrentFederalTaxExpenseBenefit $ 3,146us-gaap_CurrentFederalTaxExpenseBenefit
State 143us-gaap_CurrentStateAndLocalTaxExpenseBenefit 99us-gaap_CurrentStateAndLocalTaxExpenseBenefit 94us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred (benefit) provision:      
Federal (762)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 57us-gaap_DeferredFederalIncomeTaxExpenseBenefit (493)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State (43)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 21us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (5)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total income tax provision $ 3,613us-gaap_IncomeTaxExpenseBenefit $ 2,502us-gaap_IncomeTaxExpenseBenefit $ 2,742us-gaap_IncomeTaxExpenseBenefit