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OTHER INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2016
OTHER INTANGIBLE ASSETS  
Schedule of gross carrying value and accumulated amortization related to intangible assets
The following table presents changes in other intangible assets for the three months ended March 31, 2016:
 
(dollars in thousands)
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
Balance, beginning of period
$
7,355

 
$
17,797

 
$
25,152

Additions
—

 
512

 
512

Amortization
(669
)
 
(1,509
)
 
(2,178
)
Balance, end of period
$
6,686

 
$
16,800

 
$
23,486

The gross carrying value and accumulated amortization related to our intangible assets are presented below:
 
 
March 31, 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

 
$
(37,956
)
 
$
6,686

 
$
44,642

 
$
(37,287
)
 
$
7,355

Mortgage servicing rights
59,513

 
(42,713
)
 
16,800

 
59,001

 
(41,204
)
 
17,797

Total
$
104,155

 
$
(80,669
)
 
$
23,486

 
$
103,643

 
$
(78,491
)
 
$
25,152
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 March 31,
(dollars in thousands)
2016
 
2015
Fair market value, beginning of period
$
18,345

 
$
19,975

Fair market value, end of period
17,195

 
19,172

Weighted average discount rate
9.5
%
 
9.5
%
Forecasted constant prepayment rate assumption
15.3

 
13.9
Schedule of estimated amortization expense
Based on the core deposit premium and mortgage servicing rights held as of March 31, 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)
$
2,006

 
$
4,241

 
$
6,247

2017
2,674

 
3,428

 
6,102

2018
2,006

 
2,381

 
4,387

2019
—

 
1,546

 
1,546

2020
—

 
930

 
930

2021
—

 
147

 
147

Thereafter
—

 
4,127

 
4,127

 
$
6,686

 
$
16,800

 
$
23,486