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Goodwill and other intangibles
 3 Months Ended
Mar. 31, 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 periods ended March 31, 2021 and 2020.
(in thousands)GoodwillOther
intangible assets		Total
December 31, 2019$159,595 $11,523 $171,118 
Amortization— 606 606 
March 31, 2020$159,595 $10,917 $170,512 
December 31, 2020$159,595 $9,260 $168,855 
Amortization— 479 479 
March 31, 2021$159,595 $8,781 $168,376 
   
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, 2020, the Company determined that goodwill for Park's reporting unit, PNB, was not impaired. During each of the second, third and fourth quarters of 2020, management determined that the deterioration in general economic conditions as a result of the COVID-19 pandemic and responses thereto represented a triggering event prompting an evaluation of goodwill impairment. Based on the qualitative analysis performed during each of the second, third and fourth quarters of 2020, the Company determined that goodwill 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 March 31, 2021 and December 31, 2020.

March 31, 2021December 31, 2020
(in thousands)Gross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Other intangible assets:
Core deposit intangible assets$14,456 $5,675 $14,456 $5,196 
Trade name intangible assets1,300 1,300 1,300 1,300 
Total$15,756 $6,975 $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 $606,000 for the three months ended March 31, 2021 and 2020, respectively.

Estimated amortization expense related to core deposit intangible assets for each of the next five years follows:

(in thousands)Total
Nine months ending December 31, 2021$1,319 
20221,487 
20231,323 
20241,215 
20251,042