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Other Real Estate Owned - Summary of Activity in OREO Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Real Estate [Roll Forward]
Beginning balance	$ 3,731	$ 7,005
Transfers from loan portfolio, at fair value	1,207	147	$ 4,516
Impairments	(249)	(505)
Sales	(601)	(2,916)
Ending balance	$ 4,088	$ 3,731	$ 7,005

X

- Definition

The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy net of gains (losses) realized.

+ References

No definition available.

+ Details

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X

- Definition

Impairments of other real estate owned

+ References

No definition available.

+ Details

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Namespace Prefix:	nbhc_
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Balance Type:	credit
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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-3

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-Topic 310
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-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11

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X

- Definition

Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-4

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-URI https://asc.fasb.org//1943274/2147482913/230-10-50-5

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