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Employee Benefits - 401(k) Plan (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Benefit Plan      
Percentage of participant's contribution matched by Company 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch    
Company contributions $ 798us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 690us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 592us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Maximum      
Benefit Plan      
Percentage of participant's salary matched by Company 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember