Name:	necb_EmployeeBenefitPlanDiscretionaryNonElectiveContributionsMade
Namespace Prefix:	necb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the minimum age criteria for plan eligibility under (employee benefit plan (EBP)).

No definition available.

Name:	necb_EmployeeBenefitPlanMinimumAgeForPlanEligibility
Namespace Prefix:	necb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the minimum working hours criteria for plan eligibility under (employee benefit plan (EBP)) for discretionary non-elective contributions.

No definition available.

Name:	necb_EmployeeBenefitPlanMinimumParticipantsMinimumWorkingHours
Namespace Prefix:	necb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Percentage of annual increase to deferral rate for employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

Name:	necb_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRateAnnualIncrease
Namespace Prefix:	necb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Indicates participation status (nonparticipant- or participant-directed) when only one is applicable to investment program offered by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477783/962-325-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-8

Name:	us-gaap-ebp_EbpInvestmentProgramSingleParticipationStatusExtensibleEnumeration
Namespace Prefix:	us-gaap-ebp_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.