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Goodwill and other intangibles
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Other Intangible Assets
The following tables show the activity in goodwill and other intangible assets for the three-month and six-month periods ended June 30, 2021 and 2020.
(in thousands)GoodwillOther
intangible assets		Total
April 1, 2020$159,595 $10,917 $170,512 
Amortization— 607 607 
June 30, 2020$159,595 $10,310 $169,905 
April 1, 2021$159,595 $8,781 $168,376 
Amortization— 479 479 
June 30, 2021$159,595 $8,302 $167,897 

(in thousands)GoodwillOther
intangible assets		Total
December 31, 2019$159,595 $11,523 $171,118 
Amortization— 1,213 1,213 
June 30, 2020$159,595 $10,310 $169,905 
December 31, 2020$159,595 $9,260 $168,855 
Amortization— 958 958 
June 30, 2021$159,595 $8,302 $167,897 
   
Park evaluates goodwill for impairment during the second quarter of each year, with financial data as of March 31. Based on the analysis performed as of April 1, 2021, the Company determined that goodwill for Park's reporting unit, PNB, was not impaired. Management continues to monitor economic factors, including economic conditions as a result of the COVID-19 pandemic and responses thereto, to evaluate goodwill impairment.

Acquired Intangible Assets

The following table shows the balance of acquired intangible assets as of June 30, 2021 and December 31, 2020.
June 30, 2021December 31, 2020
(in thousands)Gross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Other intangible assets:
Core deposit intangible assets$14,456 $6,154 $14,456 $5,196 
Trade name intangible assets1,300 1,300 1,300 1,300 
Total$15,756 $7,454 $15,756 $6,496 

Core deposit intangible assets are being amortized, on an accelerated basis, over a period of ten years. Aggregate amortization expense was $479,000 and $607,000 for the three months ended June 30, 2021 and 2020, respectively, and was $958,000 and $1.2 million for the six months ended June 30, 2021 and 2020, respectively.
Estimated amortization expense related to core deposit intangible assets for each of the next five years follows:

(in thousands)Total
Six months ending December 31, 2021$840 
20221,487 
20231,323 
20241,215 
20251,042