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Mortgage Servicing Rights (Tables)
 3 Months Ended
Mar. 31, 2019
Mortgage Servicing Rights [Abstract]  
Mortgage servicing rights
The following table explains changes in the servicing asset during the three months ended March 31, 2019 and 2018.
(Dollars in thousands)
Total
Balance at December 31, 2018
$
21,396

Servicing rights originated
859

Amortization
(1,447
)
Valuation allowance provision
(161
)
Balance at March 31, 2019
$
20,647

 
 
Balance at December 31, 2017
$
21,945

Servicing rights originated
1,200

Amortization
(1,486
)
Balance at March 31, 2018
$
21,659
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 were as follows:
 
March 31, 2019
 
December 31, 2018
Discount rate - conventional fixed loans
9.41
%
 
9.69
%
Discount rate - all loans excluding conventional fixed loans
10.41
%
 
10.69
%
Weighted average constant prepayment rate
11.28
%
 
9.26
%
Weighted average cost to service a loan
$
88.07

 
$
87.52