Goodwill and other intangibles (Tables)

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

The following table shows the activity in goodwill and other intangible assets for the three months ended March 31, 2020 and 2019.

(in thousands)	Goodwill		Other intangible assets		Total
December 31, 2018	$	112,739	$	6,971	$	119,710
Acquired goodwill and other intangible assets	—		—		—
Amortization	—		289		289
March 31, 2019	$	112,739	$	6,682	$	119,421
December 31, 2019	$	159,595	$	11,523	$	171,118
Acquired goodwill and other intangible assets	—		—		—
Amortization	—		606		606
March 31, 2020	$	159,595	$	10,917	$	170,512

Intangible Assets Disclosure [Text Block]

The following table shows the balance of acquired intangible assets as of March 31, 2020 and December 31, 2019.

	March 31, 2020				December 31, 2019
(in thousands)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Other intangible assets:
Core deposit intangible assets	$	14,456	$	3,539	$	14,456	$	2,933
Trade name intangible assets	1,300		1,300		1,300		1,300
Total	$	15,756	$	4,839	$	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
Nine months ending December 31, 2020	$	1,657
2021	1,798
2022	1,487
2023	1,323
2024	1,215