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Mortgage Servicing Rights (Tables)
 3 Months Ended
Mar. 31, 2018
Mortgage Servicing Rights [Abstract]  
Mortgage servicing rights
The activity of the servicing asset for the three months ended March 31, 2018 and 2017 is presented in the following table:
 
Three months ended March 31
(Dollars in thousands)
2018
 
2017
Beginning balance
$
21,945

 
$
20,415

Servicing rights originated
1,200

 
1,702

Amortization
(1,486
)
 
(1,350
)
Valuation allowance reversal
—

 
4

Ending balance
$
21,659

 
$
20,771
Mortgage servicing rights valuation allowance
Mortgage servicing rights economic assumptions
Valuation of mortgage servicing rights is performed using a pooling methodology. Similar loans are pooled together and evaluated on a discounted earnings basis to determine the present value of future earnings. Key economic assumptions used to value mortgage servicing rights as of March 31, 2018 and December 31, 2017 were as follows:
 
March 31, 2018
 
December 31, 2017
Discount rate - conventional fixed loans
9.74
%
 
9.41
%
Discount rate - all loans excluding conventional fixed loans
10.74
%
 
10.41
%
Weighted average constant prepayment rate
9.15
%
 
10.93
%
Weighted average cost to service a loan
$
72.8

 
$
64.03