Allowance for Credit Losses and Reserve for Unfunded Loan Commitments - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Reserve for impairment	$ 1.6	$ 2.8
Reserve for credit losses on equity security	1.2	0.0
Reserve for credit loss on debt security held to maturity	0.0	0.0
Unfunded loan commitment
Financing Receivable, Allowance for Credit Loss [Line Items]
Reserve for commitments	$ 0.6	$ 0.6

The amount of reserve for impairment on available for sale debt securities.

No definition available.

Name:	unty_DebtSecuritiesAvailableForSaleReserveForImpairment
Namespace Prefix:	unty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of reserve maintained by the entity for providing credit losses relating to the held to maturity debt securities as of the reporting date.

+ References

No definition available.

+ Details

Name:	unty_DebtSecuritiesHeldToMaturityReserveForCreditLosses
Namespace Prefix:	unty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of reserve maintained by the entity for providing credit losses relating to the equity securities as of the reporting date.

+ References

No definition available.

+ Details

Name:	unty_EquitySecuritiesReserveForCreditLosses
Namespace Prefix:	unty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

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

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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

- Details

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