v3.26.1
Goodwill and other intangibles (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Intangible Asset, Finite-Lived [Line Items]        
Goodwill $ 263,424,000 $ 159,595,000 $ 159,595,000 $ 159,595,000
Intangible Asset, Finite-Lived, Amortization Expense 1,279,000 274,000    
Intangible Asset, Including Goodwill, after Accumulated Amortization 302,565,000 162,758,000 161,990,000 163,032,000
Acquired goodwill and other intangible assets 141,854,000      
Finite-lived Intangible Assets Acquired 52,481,000   14,456,000  
Intangible Asset, Finite-Lived, Accumulated Amortization 13,340,000   12,061,000  
Goodwill, Acquired During Period 103,829,000      
Core Deposits [Member]        
Intangible Asset, Finite-Lived [Line Items]        
Other Intangible Assets, Net 35,556,000 3,163,000 2,395,000 3,437,000
Intangible Asset, Finite-Lived, Amortization Expense 1,279,000 274,000    
Finite-lived Intangible Assets Acquired 48,896,000   14,456,000  
Intangible Asset, Finite-Lived, Accumulated Amortization 13,340,000   12,061,000  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 5,349,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Two 6,442,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Three 5,679,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4,572,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,809,000      
Intangible Asset, Finite-Lived, Acquired 34,440,000      
Other Intangible Assets        
Intangible Asset, Finite-Lived [Line Items]        
Other Intangible Assets, Net 3,585,000 0 0 $ 0
Intangible Asset, Finite-Lived, Amortization Expense 0 $ 0    
Intangible Asset, Finite-Lived, Acquired 3,585,000      
Customer Relationships        
Intangible Asset, Finite-Lived [Line Items]        
Finite-lived Intangible Assets Acquired 3,585,000   0  
Intangible Asset, Finite-Lived, Accumulated Amortization 0   $ 0  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 598,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Two 592,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Three 527,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Four 462,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 397,000