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OTHER INTANGIBLE ASSETS (Tables)
 6 Months Ended
Jun. 30, 2016
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 intangible assets are presented below:
 
 
June 30, 2016
 
December 31, 2015
(dollars in thousands)
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
Core deposit premium
$
44,642

 
$
(38,624
)
 
$
6,018

 
$
44,642

 
$
(37,287
)
 
$
7,355

Mortgage servicing rights
60,246

 
(44,468
)
 
15,778

 
59,001

 
(41,204
)
 
17,797

Total
$
104,888

 
$
(83,092
)
 
$
21,796

 
$
103,643

 
$
(78,491
)
 
$
25,152

The following table presents changes in other intangible assets for the six months ended June 30, 2016:
 
(dollars in thousands)
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
Balance, beginning of period
$
7,355

 
$
17,797

 
$
25,152

Additions
—

 
1,245

 
1,245

Amortization
(1,337
)
 
(3,264
)
 
(4,601
)
Balance, end of period
$
6,018

 
$
15,778

 
$
21,796
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 June 30,
(dollars in thousands)
2016
 
2015
Fair market value, beginning of period
$
18,345

 
$
19,975

Fair market value, end of period
16,123

 
19,202

Weighted average discount rate
9.5
%
 
9.5
%
Forecasted constant prepayment rate assumption
16.5

 
13.8
Schedule of estimated amortization expense
Based on the core deposit premium and mortgage servicing rights held as of June 30, 2016, estimated amortization expense for the remainder of fiscal year 2016, 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
2016 (remainder)
$
1,338

 
$
2,272

 
$
3,610

2017
2,674

 
3,816

 
6,490

2018
2,006

 
3,030

 
5,036

2019
—

 
2,484

 
2,484

2020
—

 
2,074

 
2,074

2021
—

 
1,647

 
1,647

Thereafter
—

 
455

 
455

 
$
6,018

 
$
15,778

 
$
21,796