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Goodwill and other intangibles (Tables)
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block]
The following table shows the activity in goodwill and other intangible assets for the three-month and nine-month periods ended September 30, 2024 and 2023.

(in thousands)GoodwillOther
intangible assets		Total
July 1, 2023$159,595 $5,320 $164,915 
Amortization— 334 334 
September 30, 2023$159,595 $4,986 $164,581 
July 1, 2024$159,595 $4,012 $163,607 
Amortization— 287 287 
September 30, 2024$159,595 $3,725 $163,320 
(in thousands)GoodwillOther
intangible assets		Total
December 31, 2022$159,595 $5,975 $165,570 
Amortization— 989 989 
September 30, 2023$159,595 $4,986 $164,581 
December 31, 2023$159,595 $4,652 $164,247 
Amortization— 927 927 
September 30, 2024$159,595 $3,725 $163,320 
Intangible Assets Disclosure [Text Block]
The following table shows the balance of acquired intangible assets at September 30, 2024 and at December 31, 2023:

September 30, 2024
December 31, 2023
(in thousands)Gross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Other intangible assets:
Core deposit intangible assets$14,456 $10,731 $14,456 $9,804 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Estimated amortization expense related to core deposit intangible assets for the remainder of 2024 and the next four years follows:

(in thousands)Total
Three months ending December 31, 2024$287 
20251,042 
2026887 
2027754 
2028618