XML 56 R46.htm IDEA: XBRL DOCUMENT v3.25.3

Employee Benefits - Deferred Compensation Plans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Officers Deferred Compensation Plan
Deferred Compensation Plans
Obligation under the plan	$ 2,300,000		$ 2,300,000		$ 2,600,000
Expenses under the plan	89,000	$ 100,000	266,000	$ 299,000
Deferred Compensation Plans
Deferred Compensation Plans
Obligation under the plan	4,900,000		4,900,000		878,000
Expenses under the plan	86,000	8,000	258,000	24,000
Long-Term Incentive Plan
Deferred Compensation Plans
Obligation under the plan	7,200,000		7,200,000		$ 14,600,000
Expenses under the plan	$ 946,000	$ 1,800,000	$ 2,600,000	$ 5,000,000
Incentive plan vesting period			3 years
Minimum | Officers Deferred Compensation Plan
Deferred Compensation Plans
Percentage of employee's then current base salary being credited to the participant's account annually			5.00%
Maximum | Officers Deferred Compensation Plan
Deferred Compensation Plans
Percentage of employee's then current base salary being credited to the participant's account annually			20.00%

X

- Definition

Incentive plan vesting period

+ References

No definition available.

+ Details

Name:	nbbk_IncentivePlanVestingPeriod
Namespace Prefix:	nbbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of liability, recognized in statement of financial position, for defined contribution plan.

+ References

No definition available.

+ Details

Name:	nbbk_LiabilityDefinedContributionPlan
Namespace Prefix:	nbbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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

X

- 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
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=nbbk_OfficersDeferredCompensationPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=nbbk_DeferredCompensationPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=nbbk_LongTermIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: