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Loans - Schedule of Modified Loans to Borrowers Experiencing Financial Difficulty (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Extended Maturity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 4,000
% of loan class	0.10%
Extended Maturity [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class	0.00%
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class	0.00%
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class	0.00%
Extended Maturity [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 4,000
% of loan class	0.30%
Extended Maturity [Member] | Residential Portfolio Segment [Member] | Sr lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 4,000
% of loan class	0.30%
Payment Deferral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 270
% of loan class	0.00%
Payment Deferral [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 270
% of loan class	0.00%
Payment Deferral [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 154
% of loan class	0.00%
Payment Deferral [Member] | Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 116
% of loan class	0.00%
Payment Deferral [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class	0.00%
Payment Deferral [Member] | Residential Portfolio Segment [Member] | Sr lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class	0.00%

X

- Definition

Amortized cost of financing receivable modified.

+ References

No definition available.

+ Details

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

X

- Definition

Financing receivables modified as percent of total financing receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	nbhc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_SeniorLienMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: