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Consolidated Statement of Changes in Shareholders' Equity (Parenthetical)	9 Months Ended
	Sep. 30, 2024 shares
Consolidated Statement of Changes in Shareholders' Equity
ESOP shares committed to be released	127,766
Common shares ESOP	2,416,458

X

- Definition

Number of shares purchased by the Employee Stock Ownership Plan.

+ References

No definition available.

+ Details

Name:	nbbk_SharesPurchaseByEmployeeStockOwnershipPlanShares
Namespace Prefix:	nbbk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480489/718-40-50-1

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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