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Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Oct. 10, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Liabilities assumed:        
Goodwill   $ 416,968 $ 365,164 $ 365,164
Branch Acquisition        
Assets acquired:        
Cash and due from banks $ 2,235      
Loans 291,013      
ACL on loans (3,298)      
Total loans, net 287,715      
Fixed assets, net 8,783      
Intangible assets, net 16,414      
Other assets 4,353      
Total assets acquired 319,500      
Liabilities assumed:        
Deposits 641,718      
Other liabilities 4,387      
Total liabilities assumed 646,105      
Net assets acquired (326,605)      
Total consideration received (274,801)      
Goodwill 51,804      
Branch Acquisition | As Recorded by First Interstate        
Assets acquired:        
Cash and due from banks 2,235      
Loans 297,423      
ACL on loans 0      
Total loans, net 297,423      
Fixed assets, net 8,623      
Intangible assets, net 0      
Other assets 4,020      
Total assets acquired 312,301      
Liabilities assumed:        
Deposits 641,581      
Other liabilities 4,387      
Total liabilities assumed 645,968      
Net assets acquired (333,667)      
Branch Acquisition | Adjustments        
Assets acquired:        
Cash and due from banks 0      
Loans (6,410)      
ACL on loans (3,298)      
Total loans, net (9,708)      
Fixed assets, net 160      
Intangible assets, net 16,414      
Other assets 333      
Total assets acquired 7,199      
Liabilities assumed:        
Deposits 137      
Other liabilities 0      
Total liabilities assumed 137      
Net assets acquired $ 7,062