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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Tables)
 3 Months Ended
Mar. 31, 2019
OTHER INTANGIBLE ASSETS  
Schedule of gross carrying value and accumulated amortization related to intangible assets
The following table presents changes in core deposit premium and mortgage servicing rights for the periods presented:
 
(dollars in thousands)
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
Balance, January 1, 2018
$
2,006

 
$
15,843

 
$
17,849

Additions
—

 
435

 
435

Amortization
(669
)
 
(457
)
 
(1,126
)
Balance, March 31, 2018
$
1,337

 
$
15,821

 
$
17,158

 
 
 
 
 
 
Balance, January 1, 2019
$
—

 
$
15,596

 
$
15,596

Additions
—

 
222

 
222

Amortization
—

 
(471
)
 
(471
)
Balance, March 31, 2019
$
—

 
$
15,347

 
$
15,347

The gross carrying value and accumulated amortization related to our core deposit premium and mortgage servicing rights are presented below:
 
 
March 31, 2019
 
December 31, 2018
(dollars in thousands)
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
Core deposit premium
$
44,642

 
$
(44,642
)
 
$
—

 
$
44,642

 
$
(44,642
)
 
$
—

Mortgage servicing rights
66,235

 
(50,888
)
 
15,347

 
66,013

 
(50,417
)
 
15,596

Total
$
110,877

 
$
(95,530
)
 
$
15,347

 
$
110,655

 
$
(95,059
)
 
$
15,596
Schedule of fair market value and key assumptions used in determining the fair market value of our mortgage servicing rights
The following table presents the fair market value and key assumptions used in determining the fair market value of our mortgage servicing rights:
 
 
Three Months Ended
 
Three Months Ended
(dollars in thousands)
March 31, 2019
 
March 31, 2018
Fair market value, beginning of period
$
17,696

 
$
17,161

Fair market value, end of period
16,541

 
18,463

Weighted average discount rate
9.5
%
 
9.5
%
Forecasted constant prepayment rate assumption (1)
16.2

 
14.2
Schedule of estimated amortization expense
Based on the mortgage servicing rights held as of March 31, 2019, estimated amortization expense for the remainder of fiscal year 2019, the next five succeeding fiscal years and all years thereafter are as follows:
 
(dollars in thousands)
 
2019 (remainder)
$
1,263

2020
1,382

2021
1,130

2022
945

2023
786

2024
704

Thereafter
9,137

Total
$
15,347