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Loans (Troubled Debt Restructurings Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Average Recorded Investment $ 12,021,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment $ 14,023,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment  
Impaired Financing Receivable, Related Allowance 981,000us-gaap_ImpairedFinancingReceivableRelatedAllowance   1,161,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
Troubled Debt Restructuring (TDR) [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Average Recorded Investment 6,400,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= unty_TroubledDebtRestructuringTdrMember
  6,500,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= unty_TroubledDebtRestructuringTdrMember
Impaired Financing Receivable, Related Allowance 23,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_InternalCreditAssessmentAxis
= unty_TroubledDebtRestructuringTdrMember
  24,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_InternalCreditAssessmentAxis
= unty_TroubledDebtRestructuringTdrMember
Loans in nonaccrual status $ 2,900,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_InternalCreditAssessmentAxis
= unty_TroubledDebtRestructuringTdrMember
  $ 3,000,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_InternalCreditAssessmentAxis
= unty_TroubledDebtRestructuringTdrMember