v3.25.3

Loans Receivable and the Allowance for Credit Losses - Narrative (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) loan	Sep. 30, 2025 USD ($) loan	Dec. 31, 2024 USD ($) loan
Loans Receivable and the Allowance for Credit Losses
Loans serviced for the benefit of others	$ 53,000,000	$ 53,000,000	$ 52,500,000
Recovery	99,000	533,000
Individually evaluated loans			$ 241,000
Interest income recognized from individually evaluated loans	$ 5,000	$ 14,000
Non-accrual loans \| loan	0	0	0
Number of loans modified that were deemed troubled debt restructuring \| loan		0	0
Construction
Loans Receivable and the Allowance for Credit Losses
Number of loans individually evaluated for impairment \| loan	0	0	1
Non-residential loans
Loans Receivable and the Allowance for Credit Losses
Recovery		$ 350,000
Consumer
Loans Receivable and the Allowance for Credit Losses
Net charge off		494,000
Consumer loans in primarily attributed net recovery	$ 24,000
Recovery	$ 99,000	$ 183,000

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable resulting from previously written off that have been recovered during the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest income on financing receivable that were individually evaluated for impairment.

+ References

No definition available.

+ Details

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

- Definition

Number of financing receivables that were individually evaluated for impairment.

+ References

No definition available.

+ Details

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Namespace Prefix:	necb_
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Balance Type:	na
Period Type:	instant

- Definition

The carrying amount of loans receivable serviced for the benefit of others.

+ References

No definition available.

+ Details

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Namespace Prefix:	necb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of Nonaccrual Loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	necb_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Number of loans modified that were deemed troubled debt restructuring.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease.

+ References

Reference 1: 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

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

- Definition

Amount of financing receivable individually evaluated for credit loss. Excludes financing receivable collectively evaluated for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.5.a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11C

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- 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.

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- Details

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NorthEast Community Bancorp, Inc./MD/ 10-Q