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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Derivatives - Derivatives on the Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Designated as hedging instrument
Derivatives
Amount of (loss) gain recognized in income on derivatives	$ 3,656	$ (1,630)	$ 5,423	$ (6,828)
Fair value hedging \| Not designated as hedging instrument
Derivatives
Amount of (loss) gain recognized in income on derivatives	(205)	(338)	120	16
Interest rate products \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncome \| Fair value hedging \| Designated as hedging instrument
Derivatives
Amount of (loss) gain recognized in income on derivatives	3,733	(1,264)	5,620	(6,107)
Interest rate products \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncome \| Cash flow hedges \| Designated as hedging instrument
Derivatives
Amount of (loss) gain recognized in income on derivatives	(77)	(366)	(197)	(721)
Interest rate products \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeMember \| Fair value hedging \| Designated as hedging instrument
Derivatives
Amount of (loss) gain recognized in income on hedged items	(3,108)	2,759	(4,366)	9,084
Interest rate products \| Location, Statement of Income, Balance [Axis]: nbhc:OtherNonInterestIncomeMember \| Fair value hedging \| Not designated as hedging instrument
Derivatives
Amount of (loss) gain recognized in income on derivatives	128	1	(3)	(1)
Interest rate lock commitments \| Location, Statement of Income, Balance [Axis]: nbhc:MortgageBankingIncomeMember \| Fair value hedging \| Not designated as hedging instrument
Derivatives
Amount of (loss) gain recognized in income on derivatives	(92)	(175)	102	359
Forward contracts \| Location, Statement of Income, Balance [Axis]: nbhc:MortgageBankingIncomeMember \| Fair value hedging \| Not designated as hedging instrument
Derivatives
Amount of (loss) gain recognized in income on derivatives	$ (241)	$ (164)	$ 21	$ (342)