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Acquisition Activities - Summary of Net Assets Acquired (Details) - USD ($)
$ / shares in Units, $ in Thousands
Oct. 01, 2022
Sep. 01, 2022
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2022
Aug. 31, 2022
Consideration:            
Goodwill     $ 306,043 $ 306,043    
Bank of Jackson Hole            
Assets:            
Cash and due from banks $ 40,509          
Investment securities available-for-sale 203,728          
Non-marketable securities 3,104          
Loans 1,185,699          
Loans held for sale 504          
Premises and equipment 30,318          
Other intangibles 30,696          
Other assets 31,970          
Total assets acquired 1,526,528          
Liabilities:            
Total deposits 1,375,593          
Long-term debt 39,229          
Fed funds purchased 25          
Other liabilities 9,483          
Total liabilities assumed 1,424,330          
Identifiable net assets acquired 102,198          
Consideration:            
NBHC common stock paid, closing price 162,459          
Cash consideration 50,989          
Business Combination, Consideration Transferred, Total 213,448          
Goodwill $ 111,250          
Closing price         $ 36.99  
Rock Canyon Bank            
Assets:            
Cash and due from banks   $ 260,883        
Investment securities available-for-sale   402        
Non-marketable securities   977        
Loans   535,197        
Loans held for sale   3,069        
Premises and equipment   3,413        
Other intangibles   16,463        
Other assets   11,749        
Total assets acquired   832,153        
Liabilities:            
Total deposits   734,480        
Other liabilities   10,115        
Total liabilities assumed   744,595        
Identifiable net assets acquired   87,558        
Consideration:            
NBHC common stock paid, closing price   124,272        
Cash consideration   16,141        
Business Combination, Consideration Transferred, Total   140,413        
Goodwill   $ 52,855        
Closing price           $ 40.13