Goodwill and other intangibles (Tables)

9 Months Ended

Sep. 30, 2019

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 nine months ended September 30, 2019 and 2018.

(in thousands)	Goodwill		Other intangible assets		Total
December 31, 2017	$	72,334	$	—	$	72,334
Acquired goodwill and other intangible assets	40,405		7,549		47,954
Amortization	—		289		289
September 30, 2018	$	112,739	$	7,260	$	119,999
December 31, 2018	$	112,739	$	6,971	$	119,710
Acquired goodwill and other intangible assets	45,260		10,251		55,511
Amortization	—		1,732		1,732
September 30, 2019	$	157,999	$	15,490	$	173,489

Intangible Assets Disclosure [Text Block]

The following table shows the balance of acquired intangible assets as of September 30, 2019 and December 31, 2018.

	September 30, 2019				December 31, 2018
(in thousands)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Other intangible assets:
Core deposit intangible assets	$	16,500	$	2,310	$	6,249	$	578
Trade name intangible assets	1,300		—		1,300		—
Total	$	17,800	$	2,310	$	7,549	$	578

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 periods listed below follows:

(in thousands)	Total
Three months ending December 31, 2019	$	741
2020	2,502
2021	2,040
2022	1,725
2023	1,548