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Employee Benefits - Benefit Plan (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Benefit Plan    
Percentage of participant's contribution matched by Company 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch  
Company contributions $ 243us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 187us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Maximum    
Benefit Plan    
Percentage of participant's salary matched by Company 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember