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Goodwill and other intangibles (Tables)
 9 Months Ended
Sep. 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 nine-month periods ended September 30, 2021 and 2020.
(in thousands)GoodwillOther
intangible assets		Total
July 1, 2020$159,595 $10,310 $169,905 
Amortization— 525 525 
September 30, 2020$159,595 $9,785 $169,380 
July 1, 2021$159,595 $8,302 $167,897 
Amortization— 420 420 
September 30, 2021$159,595 $7,882 $167,477 

(in thousands)GoodwillOther
intangible assets		Total
December 31, 2019$159,595 $11,523 $171,118 
Amortization— 1,738 1,738 
September 30, 2020$159,595 $9,785 $169,380 
December 31, 2020$159,595 $9,260 $168,855 
Amortization— 1,378 1,378 
September 30, 2021$159,595 $7,882 $167,477 
Intangible Assets Disclosure [Text Block]
The following table shows the balance of acquired intangible assets as of September 30, 2021 and December 31, 2020.
September 30, 2021December 31, 2020
(in thousands)Gross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Other intangible assets:
Core deposit intangible assets$14,456 $6,574 $14,456 $5,196 
Trade name intangible assets1,300 1,300 1,300 1,300 
Total$15,756 $7,874 $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
Three months ending December 31, 2021$420 
20221,487 
20231,323 
20241,215 
20251,042