v3.26.1
Goodwill and other intangibles (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Intangible Asset, Finite-Lived [Line Items]                
Goodwill $ 263,917,000 $ 159,595,000 $ 263,917,000 $ 159,595,000 $ 263,424,000 $ 159,595,000 $ 159,595,000 $ 159,595,000
Intangible Asset, Finite-Lived, Amortization Expense 2,072,000 273,000 3,351,000 547,000        
Intangible Asset, Including Goodwill, after Accumulated Amortization 300,986,000 162,485,000 300,986,000 162,485,000 302,565,000 161,990,000 162,758,000 163,032,000
Acquired goodwill and other intangible assets 493,000   142,347,000          
Finite-lived Intangible Assets Acquired 52,481,000   52,481,000     14,456,000    
Intangible Asset, Finite-Lived, Accumulated Amortization 15,412,000   15,412,000     12,061,000    
Goodwill, Acquired During Period 493,000   104,322,000          
Core Deposits [Member]                
Intangible Asset, Finite-Lived [Line Items]                
Other Intangible Assets, Net 33,756,000 2,890,000 33,756,000 2,890,000 35,556,000 2,395,000 3,163,000 3,437,000
Intangible Asset, Finite-Lived, Amortization Expense 1,800,000 273,000 3,079,000 547,000        
Finite-lived Intangible Assets Acquired 48,896,000   48,896,000     14,456,000    
Intangible Asset, Finite-Lived, Accumulated Amortization 15,140,000   15,140,000     12,061,000    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 3,549,000   3,549,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Two 6,442,000   6,442,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Three 5,679,000   5,679,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4,572,000   4,572,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,809,000   3,809,000          
Intangible Asset, Finite-Lived, Acquired 0   34,440,000          
Other Intangible Assets                
Intangible Asset, Finite-Lived [Line Items]                
Other Intangible Assets, Net 3,313,000 0 3,313,000 0 $ 3,585,000 0 $ 0 $ 0
Intangible Asset, Finite-Lived, Amortization Expense 272,000 $ 0 272,000 $ 0        
Intangible Asset, Finite-Lived, Acquired 0   3,585,000          
Customer Relationships                
Intangible Asset, Finite-Lived [Line Items]                
Finite-lived Intangible Assets Acquired 3,585,000   3,585,000     0    
Intangible Asset, Finite-Lived, Accumulated Amortization 272,000   272,000     $ 0    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 326,000   326,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Two 592,000   592,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Three 527,000   527,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Four 462,000   462,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 396,000   $ 396,000