Derivative Financial Instruments and Hedging Activities (Details) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020 USD ($) instrument contract	Dec. 31, 2019 USD ($) contract
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 100,000	$ 60,000
Interest rate swap agreements \| Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 100,000	60,000
New swap agreements \| instrument	2
Notional value of new swap agreement	$ 20,000
Fair value	$ (1,512)	$ 238
Weighted average pay rate	1.19%	1.42%
Weighted average receive rate	1.24%	2.19%
Weighted average maturity	2 years 3 months 29 days	1 year 3 months
Number of contracts \| contract	6	4

Nominal or face amount of new swap agreement.

No definition available.

Name:	unty_DerivativeNotionalAmountOfNewSwapAgreement
Namespace Prefix:	unty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of new derivative instrument agreements entered into by the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	unty_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Derivative, Weighted Average Pay Rate

+ References

No definition available.

+ Details

Name:	unty_DerivativeWeightedAveragePayRate
Namespace Prefix:	unty_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Derivative, Weighted Average Receive Interest Rate

+ References

No definition available.

+ Details

Name:	unty_DerivativeWeightedAverageReceiveInterestRate
Namespace Prefix:	unty_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Average remaining period until maturity of the derivative contract, 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_DerivativeAverageRemainingMaturity1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: