Number of FHLB Advances

No definition available.

Name:	unty_NumberOfFhlbAdvances
Namespace Prefix:	unty_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of FHLB Repurchase Agreements.

+ References

No definition available.

+ Details

Name:	unty_NumberOfFhlbRepurchaseAgreements
Namespace Prefix:	unty_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of advances from the Federal Home Loan Bank (FHLB).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22 (b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 10
-Section 55
-Paragraph 51
-URI http://asc.fasb.org/extlink&oid=77903054&loc=d3e101761-111710

+ Details

Name:	us-gaap_SecuredDebtRepurchaseAgreements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=unty_FhlbRepurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis=unty_FederalHomeLoanBankOvernightLineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_Six10MillionAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=unty_FHLBAdvanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_Two20MillionAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_Five10MillionAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_One20MillionAdvanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_A1.730PercentAdvanceDueJune72018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_A1.103PercentAdvanceDueFebruary162018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_A1.80PercentAdvanceDueJuly72021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_A2.10PercentAdvanceDueDecember232020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_A1.048PercentAdvanceDueJanuary52018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_A2.02PercentDueOctober272020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unty_A2.15PercentAdvanceDueOctober272020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Borrowed Funds and Subordinated Debentures - Narrative (Details)				12 Months Ended
	Dec. 07, 2017 USD ($)	Sep. 16, 2017 USD ($)	Jul. 05, 2017 USD ($)	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan	Oct. 27, 2015 USD ($)
Debt Instrument [Line Items]
Interest rate	1.73%	1.103%
FHLB Repurchase Agreements
Debt Instrument [Line Items]
Number of FHLB repurchase agreements \| loan
Repurchase agreements:
Debt Instrument [Line Items]
Interest rate				3.67%
Repurchase agreements				$ 15,000,000
Debt instrument, term				10 years
FHLB Overnight Line of Credit
Debt Instrument [Line Items]
FHLB advances, maximum amount available				$ 170,000,000	$ 6,000,000.0
Interest rate				1.53%
Six 10 Million Advances \| FHLB Advance
Debt Instrument [Line Items]
Number of FHLB advances \| loan				5
FHLB amount of advances				$ 10,000,000
Two 20 Million Advances \| FHLB Advance
Debt Instrument [Line Items]
Number of FHLB advances \| loan				2
FHLB amount of advances				$ 20,000,000
Five 10 Million Advances \| FHLB Advance
Debt Instrument [Line Items]
Number of FHLB advances \| loan					6
FHLB amount of advances					$ 10,000,000
One 20 Million Advance \| FHLB Advance
Debt Instrument [Line Items]
Number of FHLB advances \| loan					2
FHLB amount of advances					$ 20,000,000
1.730 Percent Advance Due June 7, 2018 [Member] \| FHLB Advance
Debt Instrument [Line Items]
FHLB amount of advances	$ 10,000,000.0
1.730 Percent Advance Due June 7, 2018 [Member] \| LIBOR \| FHLB Advance
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	0.145%
1.103 Percent Advance Due February 16, 2018 [Member] \| FHLB Advance
Debt Instrument [Line Items]
FHLB amount of advances		$ 10,000,000.0
1.103 Percent Advance Due February 16, 2018 [Member] \| LIBOR \| FHLB Advance
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate		0.07%
1.80% Advance Due July 7, 2021 \| FHLB Advance
Debt Instrument [Line Items]
FHLB amount of advances						$ 10,000,000.0
FHLB advances, interest rate						1.80%
2.10 Percent Advance Due December 23, 2020 [Member] \| FHLB Advance
Debt Instrument [Line Items]
FHLB amount of advances						$ 10,000,000.0
FHLB advances, interest rate						2.10%
1.048 Percent Advance Due January 5, 2018 [Member] \| FHLB Advance
Debt Instrument [Line Items]
FHLB amount of advances			$ 20,000,000
Interest rate			1.048%
1.048 Percent Advance Due January 5, 2018 [Member] \| LIBOR \| FHLB Advance
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate			0.11%
2.02% Due October 27, 2020 \| FHLB Advance
Debt Instrument [Line Items]
FHLB amount of advances						$ 10,000,000.0
Interest rate						2.02%
2.15% Advance Due October 27, 2020 \| FHLB Advance
Debt Instrument [Line Items]
FHLB amount of advances						$ 10,000,000.0
Interest rate						2.15%