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Deferred Policy Acquisition Costs (Tables)
 9 Months Ended
Sep. 30, 2018
Deferred Policy Acquisition Costs Disclosures [Abstract]  
Summary of Deferred Policy Acquisition Costs
The activity in deferred policy acquisition costs, net of reinsurance transactions, is as follows (dollars in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Balance at beginning of period
$
12,021

 
$
12,649

 
$
12,781

 
$
13,290

 
 
 
 
 
 
 
 
Deferred policy acquisition costs
6,274

 
6,759

 
18,499

 
19,018

Amortization of policy acquisition costs
(6,452
)
 
(6,655
)
 
(19,437
)
 
(19,555
)
Net change
(178
)
 
104

 
(938
)
 
(537
)
 
 
 
 
 
 
 
 
Balance at end of period
$
11,843

 
$
12,753

 
$
11,843

 
$
12,753