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Goodwill and other intangible assets - Components of other intangible assets subject to amortization (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 27,096 $ 27,096
Accumulated Amortization 19,621 18,092
Net Carrying Value 7,475 9,004
Core deposits    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 12,810 12,810
Accumulated Amortization 11,956 11,315
Net Carrying Value 854 1,495
Other customer relationship    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 14,286 14,286
Accumulated Amortization 7,665 6,777
Net Carrying Value $ 6,621 $ 7,509