Goodwill and intangibles (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangibles [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	Three months ended				Six months ended
	June 30,				June 30,
	2017		2016		2017		2016
CDI, net, beginning of period	9,018		9,762		9,648		10,589
Established through acquisitions	47,950		—		47,950		—
Reductions due to sale of accounts	(3,069	)	—		(3,069	)	—
CDI current period amortization	(1,062	)	(827	)	(1,692	)	(1,654	)
Total CDI, net, at June 30	52,837		8,935		52,837		8,935

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

Years Ending December 31,
2017 remaining	2,597
2018	5,093
2019	4,994
2020	4,872
2021	4,729
Thereafter	22,164