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Goodwill and other intangibles (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Finite-Lived Intangible Assets      
Goodwill, Beginning Balance $ 75,986   $ 63,370
Goodwill, Additions     12,616
Goodwill, Ending Balance 75,986   75,986
Intangible assets, Beginning Balance 34,197    
Intangible assets, Additions     37,617
Intangible assets, Accumulated Impairment Charges 1,683 $ 0  
Intangible assets, Accumulated Amortization 1,709   3,420
Intangible assets, Ending Balance 32,488   34,197
Core deposit intangibles      
Finite-Lived Intangible Assets      
Intangible assets, Beginning Balance 33,299    
Intangible assets, Additions     36,629
Intangible assets, Accumulated Amortization 1,664   3,330
Intangible assets, Ending Balance 31,635   33,299
Wealth management customer list intangible      
Finite-Lived Intangible Assets      
Intangible assets, Beginning Balance 898    
Intangible assets, Additions     988
Intangible assets, Accumulated Amortization 45   90
Intangible assets, Ending Balance $ 853   $ 898