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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Tables)
 9 Months Ended
Sep. 30, 2018
OTHER INTANGIBLE ASSETS  
Schedule of gross carrying value and accumulated amortization related to intangible assets
The gross carrying value and accumulated amortization related to our core deposit premium and mortgage servicing rights are presented below:
 
 
September 30, 2018
 
December 31, 2017
(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

 
$
(42,636
)
 
$
2,006

Mortgage servicing rights
65,605

 
(49,971
)
 
15,634

 
64,401

 
(48,558
)
 
15,843

Total
$
110,247

 
$
(94,613
)
 
$
15,634

 
$
109,043

 
$
(91,194
)
 
$
17,849

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, 2017
$
4,680

 
$
15,779

 
$
20,459

Additions
—

 
1,857

 
1,857

Amortization
(2,006
)
 
(1,543
)
 
(3,549
)
Balance, September 30, 2017
$
2,674

 
$
16,093

 
$
18,767

 
 
 
 
 
 
Balance, January 1, 2018
$
2,006

 
$
15,843

 
$
17,849

Additions
—

 
1,204

 
1,204

Amortization
(2,006
)
 
(1,413
)
 
(3,419
)
Balance, September 30, 2018
$
—

 
$
15,634

 
$
15,634
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:
 
 
Nine Months Ended
 
Nine Months Ended
(dollars in thousands)
September 30, 2018
 
September 30, 2017
Fair market value, beginning of period
$
17,161

 
$
18,087

Fair market value, end of period
18,315

 
16,777

Weighted average discount rate
9.5
%
 
9.5
%
Forecasted constant prepayment rate assumption
14.0

 
16.5
Schedule of estimated amortization expense
Based on the mortgage servicing rights held as of September 30, 2018, estimated amortization expense for the remainder of fiscal year 2018, the next five succeeding fiscal years and all years thereafter are as follows:
 
(dollars in thousands)
 
2018 (remainder)
$
450

2019
1,566

2020
1,292

2021
1,087

2022
919

2023
789

Thereafter
9,531

 
$
15,634