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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Tables)
6 Months Ended
Jun. 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:
 
 
June 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

 
$
(43,973
)
 
$
669

 
$
44,642

 
$
(42,636
)
 
$
2,006

Mortgage servicing rights
65,208

 
(49,452
)
 
15,756

 
64,401

 
(48,558
)
 
15,843

Total
$
109,850

 
$
(93,425
)
 
$
16,425

 
$
109,043

 
$
(91,194
)
 
$
17,849

The following table presents changes in core deposit premium and mortgage servicing rights for the six months ended June 30, 2018:
 
(dollars in thousands)
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
Balance, beginning of period
$
2,006

 
$
15,843

 
$
17,849

Additions

 
807

 
807

Amortization
(1,337
)
 
(894
)
 
(2,231
)
Balance, end of period
$
669

 
$
15,756

 
$
16,425

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:
 
 
Six Months Ended
 
Six Months Ended
(dollars in thousands)
June 30, 2018
 
June 30, 2017
Fair market value, beginning of period
$
17,161

 
$
18,087

Fair market value, end of period
18,560

 
17,024

Weighted average discount rate
9.5
%
 
9.5
%
Forecasted constant prepayment rate assumption
13.9

 
16.1

Schedule of estimated amortization expense
Based on the core deposit premium and mortgage servicing rights held as of June 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:
 
 
Estimated Amortization Expense
(dollars in thousands)
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
2018 (remainder)
$
669

 
$
770

 
$
1,439

2019

 
1,323

 
1,323

2020

 
1,113

 
1,113

2021

 
934

 
934

2022

 
793

 
793

2023

 
698

 
698

Thereafter

 
10,125

 
10,125

 
$
669

 
$
15,756

 
$
16,425