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Goodwill and other intangibles (Tables)
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block]
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 
Intangible Assets Disclosure [Text Block]
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 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
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