Goodwill and other intangibles (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2019 and 2018.

(in thousands)	Goodwill		Other intangible assets		Total
December 31, 2017	$	72,334	$	—	$	72,334
Acquired goodwill and other intangible assets	—		—		—
Amortization	—		—		—
June 30, 2018	$	72,334	$	—	$	72,334
December 31, 2018	$	112,739	$	6,971	$	119,710
Acquired goodwill and other intangible assets	45,318		10,251		55,569
Amortization	—		991		991
June 30, 2019	$	158,057	$	16,231	$	174,288

Intangible Assets Disclosure [Text Block]

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

	June 30, 2019				December 31, 2018
(in thousands)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Other intangible assets:
Core deposit intangibles	$	16,500	$	1,569	$	6,249	$	578
Trade name intangible	1,300		—		1,300		—
Total	$	17,800	$	1,569	$	7,549	$	578

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Estimated amortization expense for each of the periods listed below follows:

(in thousands)	Total
Six months ending December 31, 2019	$	1,482
2020	2,502
2021	2,040
2022	1,725
2023	1,548