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Goodwill and other intangibles (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 159,595,000 $ 159,595,000 $ 159,595,000 $ 159,595,000
Other Intangible Assets, Net 3,163,000 4,332,000 3,437,000 4,652,000
Amortization of Intangible Assets 274,000 320,000    
Intangible Assets, Net (Including Goodwill) 162,758,000 $ 163,927,000 163,032,000 $ 164,247,000
Finite-lived Intangible Assets Acquired 14,456,000   14,456,000  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 768,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Two 887,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Three 754,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Four 618,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Five 136,000      
Core Deposits [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Accumulated Amortization $ 11,293,000   $ 11,019,000