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Securities (Unrealized Losses Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Investments [Line Items]    
Available-for-sale Securities, Gross Realized Gains $ 440,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 394,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Available-for-sale Securities, Gross Realized Losses 7,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 4,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Available-for-sale Securities, Gross Realized Gain (Loss) 433,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 390,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Available-for-sale Securities Pledged as Collateral 50,400,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral 74,500,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Available For Sale Securities Pledged As Collateral Against Government Deposits 32,100,000unty_AvailableForSaleSecuritiesPledgedAsCollateralAgainstGovernmentDeposits 19,900,000unty_AvailableForSaleSecuritiesPledgedAsCollateralAgainstGovernmentDeposits
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Gross Realized Gains   4,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Available-for-sale Securities, book value   60,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Number of securities sold   1unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Gross Realized Gains 143,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
9,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, book value 8,600,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
517,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Number of securities sold 4unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
2unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Agency Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Gross Realized Gains 68,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
 
Available-for-sale Securities, book value 2,600,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
 
Number of securities sold 2unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AgencySecuritiesMember
 
Corporate Bond Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Gross Realized Gains 3,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember
186,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember
Available-for-sale Securities, book value 2,000,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember
4,800,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember
Number of securities sold 1unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember
4unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember
Corporate Bond Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Gross Realized Losses 3,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unty_CorporateBondSecurities2Member
 
Available-for-sale Securities, book value 2,000,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unty_CorporateBondSecurities2Member
 
Number of securities sold 1unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unty_CorporateBondSecurities2Member
 
Asset-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Gross Realized Gains 13,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
195,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-for-sale Securities, book value 858,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
6,400,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Number of securities sold 1unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
5unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Municipal Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Gross Realized Gains 213,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
 
Available-for-sale Securities, Gross Realized Losses 4,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
4,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Available-for-sale Securities, book value $ 5,700,000unty_AvailableForSaleSecuritiesSoldSecurityAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
 
Number of securities sold 17unty_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
 
Number of securities called 1unty_NumberOfSecuritiesCalled
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
1unty_NumberOfSecuritiesCalled
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember