Loans - Troubled Debt Restructuring and Loans Accounted for Under ASC Topic 310-30 Narratives (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) item
Troubled Debt Restructurings [Member]
Debt Instrument [Line Items]
Number of restructured loans	17
Recorded investment \| $	$ 12,300
Commercial and Consumer Loans [Member]
Debt Instrument [Line Items]
Number of restructured loans	5	5
Commercial Loan [Member]
Debt Instrument [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment \| $	$ 6,400	$ 9,700
Number of consumer loans	2	2
Residential [Member]
Debt Instrument [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment \| $	$ 400
Number of consumer loans	3
Consumer [Member]
Debt Instrument [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment \| $		$ 103
Number of consumer loans		3

Represents number of consumer loans in defaulted TDRs.

No definition available.

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- Definition

Troubled Debt Restructuring Number Of Loans Restructured

+ References

No definition available.

+ Details

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Namespace Prefix:	nbhc_
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- 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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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524

+ Details

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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
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- Details

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