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Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2025
Oct. 24, 2025
Document Document And Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Entity File Number 001-35654  
Entity Registrant Name NATIONAL BANK HOLDINGS CORP  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 27-0563799  
Entity Address, Address Line One 7800 East Orchard Road, Suite 300  
Entity Address, City or Town Greenwood Village  
Entity Address, State or Province CO  
Entity Address, Postal Zip Code 80111  
City Area Code 303  
Local Phone Number 892-8715  
Title of 12(b) Security Class A Common Stock, Par Value $0.01  
Trading Symbol NBHC  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   37,819,914
Entity Central Index Key 0001475841  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Amendment Flag false