Goodwill and other intangibles (Tables)

3 Months Ended

Mar. 31, 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 periods ended March 31, 2021 and 2020.

(in thousands)	Goodwill		Other 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

Intangible Assets Disclosure [Text Block]

The following table shows the balance of acquired intangible assets as of March 31, 2021 and December 31, 2020.

	March 31, 2021				December 31, 2020
(in thousands)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Other intangible assets:
Core deposit intangible assets	$	14,456	$	5,675	$	14,456	$	5,196
Trade name intangible assets	1,300		1,300		1,300		1,300
Total	$	15,756	$	6,975	$	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
Nine months ending December 31, 2021	$	1,319
2022	1,487
2023	1,323
2024	1,215
2025	1,042