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Mortgage Servicing Rights (Tables)
 6 Months Ended
Jun. 30, 2019
Mortgage Servicing Rights [Abstract]  
Mortgage servicing rights
The following table explains changes in the servicing asset during the three and six months ended June 30, 2019 and 2018:
 
Three months ended June 30
 
Six months ended June 30
(Dollars in thousands)
2019
 
2018
 
2019
 
2018
Beginning balance
$
20,647

 
$
21,659

 
$
21,396

 
$
21,945

Servicing rights originated
1,552

 
1,430

 
2,411

 
2,630

Amortization
(1,567
)
 
(1,432
)
 
(3,014
)
 
(2,918
)
Valuation allowance credit (provision)
33

 
—

 
(128
)
 
—

Ending balance
$
20,665

 
$
21,657

 
$
20,665

 
$
21,657
Mortgage servicing rights economic assumptions Mortgage servicing rights valuations are performed using a pooling methodology where similar loans are grouped together and evaluated using discounted cash flows to estimate the present value of future earnings. Key economic assumptions used to value mortgage servicing rights were as follows:
 
June 30, 2019
 
December 31, 2018
Discount rate - conventional fixed loans
9.01
%
 
9.69
%
Discount rate - all loans excluding conventional fixed loans
10.01
%
 
10.69
%
Weighted average constant prepayment rate
13.39
%
 
9.26
%
Weighted average cost to service a loan
$
88.03

 
$
87.52