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Goodwill and other intangibles (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Finite-Lived Intangible Assets          
Goodwill, Beginning Balance $ 75,986   $ 75,986   $ 63,370
Goodwill, Additions         12,616
Goodwill, Ending Balance 75,986   75,986   75,986
Intangible assets, Beginning Balance 34,197   34,197    
Intangible assets, Additions         37,617
Intangible assets, Accumulated Impairment Charges 1,515 $ 1,665 4,882 $ 1,665  
Year-to-Date Amortization 4,958   4,958   3,420
Intangible assets, Ending Balance 29,239   29,239   34,197
Core deposit intangibles          
Finite-Lived Intangible Assets          
Intangible assets, Beginning Balance 33,299   33,299    
Intangible assets, Additions         36,629
Year-to-Date Amortization 4,828   4,828   3,330
Intangible assets, Ending Balance 28,471   28,471   33,299
Wealth management customer list intangible          
Finite-Lived Intangible Assets          
Intangible assets, Beginning Balance 898   898    
Intangible assets, Additions         988
Year-to-Date Amortization 130   130   90
Intangible assets, Ending Balance $ 768   $ 768   $ 898