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Goodwill and other intangibles (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020 and 2019.
(in thousands)GoodwillOther
intangible assets		Total
July 1, 2019$158,057 $16,231 $174,288 
Acquired goodwill and other intangible assets(58)— (58)
Amortization— 741 741 
September 30, 2019$157,999 $15,490 $173,489 
July 1, 2020$159,595 $10,310 $169,905 
Acquired goodwill and other intangible assets— — — 
Amortization— 525 525 
September 30, 2020$159,595 $9,785 $169,380 
 
(in thousands)GoodwillOther
intangible assets		Total
December 31, 2018$112,739 $6,971 $119,710 
Acquired goodwill and other intangible assets45,260 10,251 55,511 
Amortization— 1,732 1,732 
September 30, 2019$157,999 $15,490 $173,489 
December 31, 2019$159,595 $11,523 $171,118 
Acquired goodwill and other intangible assets— — — 
Amortization— 1,738 1,738 
September 30, 2020$159,595 $9,785 $169,380 
Intangible Assets Disclosure [Text Block]
The following table shows the balance of acquired intangible assets as of September 30, 2020 and December 31, 2019.

September 30, 2020December 31, 2019
(in thousands)Gross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Other intangible assets:
Core deposit intangible assets$14,456 $4,671 $14,456 $2,933 
Trade name intangible assets1,300 1,300 1,300 1,300 
Total$15,756 $5,971 $15,756 $4,233 
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, 2020$525 
20211,798 
20221,487 
20231,323 
20241,215