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Intangible assets (Tables)
 6 Months Ended
Jun. 30, 2018
Intangible Assets [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
The gross carrying amount and accumulated amortization by intangible asset class were as follows:
 
(Dollars in thousands)
 
June 30, 2018
 
December 31, 2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
Trade names
$
7,874

 
$
(1,159
)
 
$
6,715

 
$
8,182

 
$
(957
)
 
$
7,225

Customer relationships
4,704

 
(456
)
 
4,248

 
4,911

 
(323
)
 
4,588

 
$
12,578

 
$
(1,615
)
 
$
10,963

 
$
13,093

 
$
(1,280
)
 
$
11,813