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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies [Abstract]  
Summary of estimated future minimum lease payments under noncancelable operating leases

 
(dollars in thousands)For the years ended December 31,
2019                               $2,048
20202,129
20212,181
20221,734
20231,278
Thereafter6,378
$15,748