Basis of Presentation - (Details)	3 Months Ended
Mar. 31, 2018 item
Accounting Policies [Abstract]
Number of full service banking offices	104

Represents the number of full service banking offices.

No definition available.

Name:	nbhc_NumberOfFullServiceBankingOffices
Namespace Prefix:	nbhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration