Loans - Impaired Loans Individually Evaluated for Impairment with Associated Allowance Amount (Details) $ in Thousands	9 Months Ended
Sep. 30, 2019 USD ($) loan	Dec. 31, 2018 USD ($)
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance	$ 744	$ 1,405
Unpaid principal balance, with related allowance	1,872	2,032
Unpaid principal balance	2,616	3,437
Recorded investment, with no related allowance	580	1,399
Recorded investment, with related allowance	1,207	1,893
Recorded investment	1,787	3,292
Specific reserves, with related allowance	558	667
Loans receivable, nonaccrual status	5,582	6,873
Increase (decrease) in impaired loans	(1,500)
SBA loans held for investment
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance	531	359
Unpaid principal balance, with related allowance	238	1,257
Unpaid principal balance	769	1,616
Recorded investment, with no related allowance	367	353
Recorded investment, with related allowance	73	1,118
Recorded investment	440	1,471
Specific reserves, with related allowance	72	540
Loans receivable, nonaccrual status	503	1,560
Commercial loans
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance	213	1,046
Unpaid principal balance, with related allowance	1,634	775
Unpaid principal balance	1,847	1,821
Recorded investment, with no related allowance	213	1,046
Recorded investment, with related allowance	1,134	775
Recorded investment	1,347	1,821
Specific reserves, with related allowance	486	127
Increase (decrease) in impaired loans	$ (1,000)
Number of loans \| loan	1
Commercial loans \| Commercial other
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with related allowance	$ 916	30
Unpaid principal balance	916	30
Recorded investment, with related allowance	416	30
Recorded investment	416	30
Specific reserves, with related allowance	416	30
Loans receivable, nonaccrual status	416	30
Commercial loans \| Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance	213	1,046
Unpaid principal balance, with related allowance	718	745
Unpaid principal balance	931	1,791
Recorded investment, with no related allowance	213	1,046
Recorded investment, with related allowance	718	745
Recorded investment	931	1,791
Specific reserves, with related allowance	70	97
Loans receivable, nonaccrual status	213	$ 1,046
SBA Loan in OREO
Financing Receivable, Impaired [Line Items]
Increase (decrease) in impaired loans	$ (328)
Number of loans \| loan	1
SBA Loan Sold
Financing Receivable, Impaired [Line Items]
Increase (decrease) in impaired loans	$ (293)
Number of loans \| loan	1
SBA Loan Removed
Financing Receivable, Impaired [Line Items]
Increase (decrease) in impaired loans	$ (276)
Number of loans \| loan	1
SBA Loans Added
Financing Receivable, Impaired [Line Items]
Increase (decrease) in impaired loans	$ 629
Number of loans \| loan	2
SBA Loan Short Sale
Financing Receivable, Impaired [Line Items]
Increase (decrease) in impaired loans	$ (184)
Number of loans \| loan	1
SBA Loans Charged Off
Financing Receivable, Impaired [Line Items]
Increase (decrease) in impaired loans	$ (154)
Number of loans \| loan	2

Financing Receivable, Recorded Investment, Increase (Decrease) In Impaired Loans

No definition available.

Name:	unty_FinancingReceivableRecordedInvestmentIncreaseDecreaseInImpairedLoans
Namespace Prefix:	unty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Financing Receivable, Recorded Investment, Number Of Loans

+ References

No definition available.

+ Details

Name:	unty_FinancingReceivableRecordedInvestmentNumberOfLoans
Namespace Prefix:	unty_
Data Type:	xbrli:integerItemType
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_FinancingReceivableImpairedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

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

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=unty_SmallBusinessAdministrationPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=unty_OtherLoanReceivableTypeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=unty_SBALoanInOREOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=unty_SBALoanSoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=unty_SBALoanRemovedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=unty_SBALoansAddedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=unty_SBALoanShortSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=unty_SBALoansChargedOffMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: