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Intangible assets (Tables)
12 Months Ended
Dec. 31, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Gross Carrying Amount and Accumulated Amortization by Intangible Asset Class
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 
Schedule of Estimated Aggregate Amortization Expense for Next Five Years 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