Borrowings (Schedule of Selected Information Regarding Repurchase Agreements) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deposits [Abstract]
Maximum amount of outstanding agreements at any month end during the period	$ 288,591	$ 133,552	$ 122,879
Average amount outstanding during the period	$ 197,726	$ 99,057	$ 84,355
Weighted average interest rate for the period	0.09%	0.13%	0.14%

Securities Sold Under Agreements To Repurchase Maximum Outstanding At Any Month End

No definition available.

Name:	nbhc_SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstandingAtAnyMonthEnd
Namespace Prefix:	nbhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration