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Goodwill and other intangibles
 6 Months Ended
Jun. 30, 2023
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 the six-month periods ended June 30, 2023 and 2022.

(in thousands)GoodwillOther
intangible assets		Total
April 1, 2022$159,595 $7,060 $166,655 
Amortization— 403 403 
June 30, 2022$159,595 $6,657 $166,252 
April 1, 2023$159,595 $5,648 $165,243 
Amortization— 328 328 
June 30, 2023$159,595 $5,320 $164,915 
   
(in thousands)GoodwillOther
intangible assets		Total
December 31, 2021$159,595 $7,462 $167,057 
Amortization— 805 805 
June 30, 2022$159,595 $6,657 $166,252 
December 31, 2022$159,595 $5,975 $165,570 
Amortization— 655 655 
June 30, 2023$159,595 $5,320 $164,915 

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, 2023, 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 June 30, 2023 and at December 31, 2022.

June 30, 2023
December 31, 2022
(in thousands)Gross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Other intangible assets:
Core deposit intangible assets$14,456 $9,136 $14,456 $8,481 
Trade name intangible assets1,300 1,300 1,300 1,300 
Total$15,756 $10,436 $15,756 $9,781 

Core deposit intangible assets are being amortized, on an accelerated basis, over a period of ten years. Aggregate amortization expense was $328,000 and $403,000 for the three months ended June 30, 2023 and 2022, respectively, and was $655,000 and $805,000 for the six months ended June 30, 2023 and 2022, respectively.
Estimated amortization expense related to core deposit intangible assets for the remainder of 2023 and the next four years follows:

(in thousands)Total
Six months ending December 31, 2023$668 
20241,215 
20251,042 
2026887 
2027754