Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

Name:	us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

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

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

+ Details

Name:	us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

+ Details

Name:	us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_NotesReceivableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

+ Details

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

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=nbhc_NonAccountingStandardCodificationThreeHundredTenToTenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=nbhc_AccountingStandardCodificationThreeHundredTenToThirtyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis=us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

Allowance for Loan Losses - (Summary of Company's Allowance for Loan Losses ("All") and Recorded Investment in Loans) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 17,613	$ 12,521
Provision (recoupment) for loan losses	12,444	6,209	$ 4,296
Ending balance	27,119	17,613	12,521
Carrying amount of loan investments				$ 2,587,673	$ 2,162,409
Loans	17,613	12,521	12,521	27,119	17,613
Total Loans				2,587,673	2,162,409
Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,892	11,241
Charge-offs	(3,537)	(2,029)
Recoveries	609	951
Provision (recoupment) for loan losses	12,078	6,729
Ending balance	26,042	16,892	11,241
Ending allowance balance individually evaluated for impairment				4,389	279
Ending allowance balance collectively evaluated for impairment				21,653	16,613
Loans individually evaluated for impairment				35,668	32,106
Loans collectively evaluated for impairment				2,349,175	1,850,658
Carrying amount of loan investments				2,384,843	1,882,764
Loans	16,892	11,241	11,241	26,042	16,892
Total Loans				2,384,843	1,882,764
ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	721	1,280
Charge-offs	(10)	(39)
Provision (recoupment) for loan losses	366	(520)
Ending balance	1,077	721	1,280
Carrying amount of loan investments				202,830	279,645
Loans	721	1,280	1,280	1,077	721
Total Loans				202,830	279,645
ASC 310-30 [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	279,645
Ending balance	202,830	279,645
Loans	279,645	279,645		202,830	279,645
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,598	4,258
Ending balance	14,389	8,598	4,258
Carrying amount of loan investments				1,052,776	795,396
Loans	8,598	4,258	4,258	14,389	8,598
Total Loans				1,052,776	795,396
Commercial Portfolio Segment [Member] \| Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,598	4,029
Charge-offs	(1,860)	(507)
Recoveries	91	315
Provision (recoupment) for loan losses	7,467	4,761
Ending balance	14,296	8,598	4,029
Ending allowance balance individually evaluated for impairment				4,045	82
Ending allowance balance collectively evaluated for impairment				10,251	8,516
Loans individually evaluated for impairment				21,494	17,468
Loans collectively evaluated for impairment				1,018,275	754,972
Loans	8,598	4,029	4,029	14,296	8,598
Commercial Portfolio Segment [Member] \| ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		229
Charge-offs		(3)
Provision (recoupment) for loan losses	93	(226)
Ending balance	93		229
Loans	93	229	229	93
Commercial Portfolio Segment [Member] \| ASC 310-30 [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	22,956
Ending balance	13,007	22,956
Loans	22,956	22,956		13,007	22,956
Agriculture [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,009	1,237
Ending balance	1,677	1,009	1,237
Carrying amount of loan investments				162,310	137,531
Loans	1,009	1,237	1,237	1,677	1,009
Total Loans				162,310	137,531
Agriculture [Member] \| Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	541	572
Charge-offs	(51)
Recoveries	7	8
Provision (recoupment) for loan losses	485	(39)
Ending balance	982	541	572
Ending allowance balance individually evaluated for impairment				1
Ending allowance balance collectively evaluated for impairment				981	541
Loans individually evaluated for impairment				2,126	3,206
Loans collectively evaluated for impairment				143,432	115,262
Loans	541	572	572	982	541
Agriculture [Member] \| ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	468	665
Provision (recoupment) for loan losses	227	(197)
Ending balance	695	468	665
Loans	468	665	665	695	468
Agriculture [Member] \| ASC 310-30 [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,063
Ending balance	16,752	19,063
Loans	19,063	19,063		16,752	19,063
Commercial Real Estate Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,819	2,276
Ending balance	5,361	3,819	2,276
Carrying amount of loan investments				655,219	561,594
Loans	3,819	2,276	2,276	5,361	3,819
Total Loans				655,219	561,594
Commercial Real Estate Portfolio Segment [Member] \| Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,597	1,984
Charge-offs	(222)
Recoveries	141	146
Provision (recoupment) for loan losses	1,618	1,467
Ending balance	5,134	3,597	1,984
Ending allowance balance individually evaluated for impairment				277	14
Ending allowance balance collectively evaluated for impairment				4,857	3,583
Loans individually evaluated for impairment				4,369	3,054
Loans collectively evaluated for impairment				501,962	366,210
Loans	3,597	1,984	1,984	5,134	3,597
Commercial Real Estate Portfolio Segment [Member] \| ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	222	292
Provision (recoupment) for loan losses	5	(70)
Ending balance	227	222	292
Loans	222	292	292	227	222
Commercial Real Estate Portfolio Segment [Member] \| ASC 310-30 [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	192,330
Ending balance	148,888	192,330
Loans	192,330	192,330		148,888	192,330
Residential Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,771	4,259
Ending balance	5,281	3,771	4,259
Carrying amount of loan investments				684,002	632,700
Loans	3,771	4,259	4,259	5,281	3,771
Total Loans				684,002	632,700
Residential Portfolio Segment [Member] \| Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,743	4,165
Charge-offs	(208)	(739)
Recoveries	140	212
Provision (recoupment) for loan losses	1,570	105
Ending balance	5,245	3,743	4,165
Ending allowance balance individually evaluated for impairment				65	181
Ending allowance balance collectively evaluated for impairment				5,180	3,562
Loans individually evaluated for impairment				7,593	8,133
Loans collectively evaluated for impairment				654,957	583,806
Loans	3,743	4,165	4,165	5,245	3,743
Residential Portfolio Segment [Member] \| ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	28	94
Provision (recoupment) for loan losses	8	(66)
Ending balance	36	28	94
Loans	28	94	94	36	28
Residential Portfolio Segment [Member] \| ASC 310-30 [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	40,761
Ending balance	21,452	40,761
Loans	40,761	40,761		21,452	40,761
Consumer Loan [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	416	491
Ending balance	411	416	491
Carrying amount of loan investments				33,366	35,188
Loans	416	491	491	411	416
Total Loans				33,366	35,188
Consumer Loan [Member] \| Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	413	491
Charge-offs	(1,196)	(783)
Recoveries	230	270
Provision (recoupment) for loan losses	938	435
Ending balance	385	413	491
Ending allowance balance individually evaluated for impairment				1	2
Ending allowance balance collectively evaluated for impairment				384	411
Loans individually evaluated for impairment				86	245
Loans collectively evaluated for impairment				30,549	30,408
Loans	413	491	$ 491	385	413
Consumer Loan [Member] \| ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3
Charge-offs	(10)	(36)
Provision (recoupment) for loan losses	33	39
Ending balance	26	3
Loans	3	3		26	3
Consumer Loan [Member] \| ASC 310-30 [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,535
Ending balance	2,731	4,535
Loans	$ 4,535	$ 4,535		$ 2,731	$ 4,535