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Intangible assets
12 Months Ended
Dec. 31, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible assets Intangible assets
The gross carrying amount and accumulated amortization by intangible asset class were as follows:
 (Dollars in thousands)(Dollars in thousands)
December 31, 2021December 31, 2020
Gross Carrying AmountAccumulated AmortizationNet Carrying ValueGross Carrying AmountAccumulated AmortizationNet Carrying Value
Trade names$11,388 $(3,866)$7,522 $11,289 $(2,733)$8,556 
Customer relationships12,427 (3,784)8,643 12,349 (2,402)9,947 
$23,815 $(7,650)$16,165 $23,638 $(5,135)$18,503 

Amortization expense of $2.5 million and $1.7 million related to intangible assets was recorded in General and administrative expenses for 2021 and 2020, respectively. The estimated aggregate amortization expense for each of the next five years are as follows:
(Dollars in thousands)
YearAmortization
2022$2,649 
20232,584 
20242,482 
20252,145 
20261,566 
Thereafter4,739 
$16,165