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Other Real Estate Owned - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Other Real Estate Owned |  |  |  |
OREO sales | $ 0 | $ 1,100 | $ 260 | $ 2,916

X
- Definition The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy net of gains (losses) realized. + References No definition available. + Details
Name: | nbhc_ProceedsFromSaleOfOtherRealEstateNetOfGainsLosses
Namespace Prefix: | nbhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration