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Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 loan
Significant Accounting Policies [Line Items]
Residential mortgage loans held for sale period	45 days
Number of primary loan segment	4
Number of loan classes	11
Buildings [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	39 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Fair values are subject to refinement maximum year	1 year
Maximum [Member] | Employee Stock Option [Member]
Significant Accounting Policies [Line Items]
Contractual term	10 years
Maximum [Member] | Building Improvements [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	15 years
Maximum [Member] | Equipment [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	7 years
Minimum [Member] | Building Improvements [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	7 years
Minimum [Member] | Equipment [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	3 years

X

- Definition

Fair Value Inputs Weighted Average Expected Term

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Loans Held For Sale Maximum Period Of Sale

+ References

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X

- Definition

Represents element information pertaining to number of loan classes to provide granularity.

+ References

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- Definition

Represents element information pertaining to number of primary loan segment.

+ References

No definition available.

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Namespace Prefix:	nbhc_
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Balance Type:	na
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- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	nbhc_
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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Namespace Prefix:
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- Details

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Namespace Prefix:
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