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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(c)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

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

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

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

- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

+ Details

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

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityAndInterestRateReductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Loans - Schedule of Modified Loans to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Term extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 152	$ 3,492	$ 211	$ 3,492
% of loan class	0.00%	0.00%	0.00%	0.00%
Term extension \| Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis			$ 59
% of loan class			0.00%
Term extension \| Residential real estate \| Senior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis			$ 59
% of loan class			0.00%
Term extension \| Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 152	$ 3,492	$ 152	$ 3,492
% of loan class	0.00%	0.10%	0.00%	0.10%
Term extension \| Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 152	$ 1,488	$ 152	$ 1,488
% of loan class	0.00%	0.10%	0.00%	0.10%
Term extension \| Commercial \| Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis		$ 2,004		$ 2,004
% of loan class	0.00%	0.20%	0.00%	0.20%
Payment Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 3,999	$ 8,277	$ 3,999	$ 13,852
% of loan class	0.00%	0.10%	0.10%	0.20%
Payment Delay \| Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class			0.00%
Payment Delay \| Residential real estate \| Senior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class			0.00%
Payment Delay \| Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 3,999	$ 8,277	$ 3,999	$ 13,852
% of loan class	0.10%	0.20%	0.10%	0.30%
Payment Delay \| Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 3,999	$ 8,277	$ 3,999	$ 11,657
% of loan class	0.10%	0.40%	0.20%	0.60%
Payment Delay \| Commercial \| Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis				$ 2,195
% of loan class	0.00%	0.00%	0.00%	0.20%
Combination - interest rate reduction and term extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 5,557		$ 5,557
% of loan class	0.10%		0.10%	0.00%
Combination - interest rate reduction and term extension \| Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class			0.00%
Combination - interest rate reduction and term extension \| Residential real estate \| Senior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class			0.00%
Combination - interest rate reduction and term extension \| Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 5,557		$ 5,557
% of loan class	0.10%		0.10%	0.00%
Combination - interest rate reduction and term extension \| Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of loan class	0.00%		0.00%	0.00%
Combination - interest rate reduction and term extension \| Commercial \| Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 5,557		$ 5,557
% of loan class	0.40%		0.50%	0.00%