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OTHER INTANGIBLE ASSETS (Tables)
 9 Months Ended
Sep. 30, 2015
OTHER INTANGIBLE ASSETS  
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 September 30,
(dollars in thousands)
2015
 
2014
Fair market value, beginning of period
$
19,975

 
$
21,399

Fair market value, end of period
18,495

 
20,471

Weighted average discount rate
9.5
%
 
9.5
%
Weighted average prepayment speed assumption
14.3

 
12.9
Schedule of gross carrying value and accumulated amortization related to intangible assets
The gross carrying value and accumulated amortization related to our intangible assets are presented below:
 
 
September 30, 2015
 
December 31, 2014
(dollars in thousands)
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
Core deposit premium
$
44,642

 
$
(36,619
)
 
$
8,023

 
$
44,642

 
$
(34,613
)
 
$
10,029

Mortgage servicing rights
58,534

 
(40,360
)
 
18,174

 
56,687

 
(37,019
)
 
19,668

 
$
103,176

 
$
(76,979
)
 
$
26,197

 
$
101,329

 
$
(71,632
)
 
$
29,697

Other intangible assets include a core deposit premium and mortgage servicing rights. The following table presents changes in other intangible assets for the nine months ended September 30, 2015:
 
(dollars in thousands)
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
Balance, beginning of period
$
10,029

 
$
19,668

 
$
29,697

Additions
—

 
1,847

 
1,847

Amortization
(2,006
)
 
(3,341
)
 
(5,347
)
Balance, end of period
$
8,023

 
$
18,174

 
$
26,197
Schedule of estimated amortization expense
Based on the core deposit premium and mortgage servicing rights held as of September 30, 2015, estimated amortization expense for the remainder of fiscal year 2015, 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
2015 (remainder)
$
669

 
$
1,159

 
$
1,828

2016
2,674

 
4,164

 
6,838

2017
2,674

 
3,156

 
5,830

2018
2,006

 
2,488

 
4,494

2019
—

 
1,906

 
1,906

2020
—

 
1,492

 
1,492

Thereafter
—

 
3,809

 
3,809

 
$
8,023

 
$
18,174

 
$
26,197