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Goodwill and other intangible assets - Components of other intangible assets subject to amortization (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 27,096,000 $ 27,096,000
Accumulated Amortization 22,396,000 21,030,000
Net Carrying Value 4,700,000 6,066,000
Core deposits    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 12,810,000 12,810,000
Accumulated Amortization 12,810,000 12,595,000
Net Carrying Value 0 215,000
Other customer relationship    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 14,286,000 14,286,000
Accumulated Amortization 9,586,000 8,435,000
Net Carrying Value $ 4,700,000 $ 5,851,000