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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies [Abstract]  
Summary of estimated future minimum lease payments under noncancelable operating leases
   
(dollars in thousands)    For the years ended December 31,
2018                                 $1,635
20191,763
20201,798
20211,831
20221,119
Thereafter5,642
$13,788