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Goodwill and other intangibles (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]                
Goodwill $ 159,595,000 $ 159,595,000 $ 159,595,000 $ 159,595,000 $ 159,595,000 $ 159,595,000 $ 159,595,000 $ 159,595,000
Other Intangible Assets, Net 3,725,000 4,986,000 3,725,000 4,986,000 4,012,000 4,652,000 5,320,000 5,975,000
Amortization of Intangible Assets 287,000 334,000 927,000 989,000        
Intangible Assets, Net (Including Goodwill) 163,320,000 $ 164,581,000 163,320,000 $ 164,581,000 $ 163,607,000 164,247,000 $ 164,915,000 $ 165,570,000
Finite-lived Intangible Assets Acquired 14,456,000   14,456,000     14,456,000    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 287,000   287,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Two 1,042,000   1,042,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Three 887,000   887,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Four 754,000   754,000          
Finite-Lived Intangible Assets, Amortization Expense, Year Five 618,000   618,000          
Core Deposits [Member]                
Finite-Lived Intangible Assets [Line Items]                
Finite-Lived Intangible Assets, Accumulated Amortization $ 10,731,000   $ 10,731,000     $ 9,804,000