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Goodwill and other intangibles
9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Other Intangible Assets
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 
   
Park evaluates goodwill for impairment during the second quarter of each year, with financial data as of the immediately prior March 31. Based on the qualitative analysis performed as of April 1, 2024, the Company determined that goodwill for Park's reporting unit, PNB, was not impaired.

Acquired Intangible Assets

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 

Core deposit intangible assets are being amortized, on an accelerated basis, over a period of ten years. Aggregate amortization expense was $287,000 and $334,000 for the three months ended September 30, 2024 and 2023, respectively and was $927,000 and $989,000 for the nine months ended September 30, 2024 and 2023, respectively.
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