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OTHER INTANGIBLE ASSETS (Tables)
3 Months Ended
Mar. 31, 2017
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:
 
 
March 31, 2017
 
December 31, 2016
(dollars in thousands)
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
Core deposit premium
$
44,642

 
$
(40,630
)
 
$
4,012

 
$
44,642

 
$
(39,962
)
 
$
4,680

Mortgage servicing rights
62,637

 
(46,790
)
 
15,847

 
62,049

 
(46,270
)
 
15,779

Total
$
107,279

 
$
(87,420
)
 
$
19,859

 
$
106,691

 
$
(86,232
)
 
$
20,459

The following table presents changes in other intangible assets for the three months ended March 31, 2017:
 
(dollars in thousands)
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
Balance, beginning of period
$
4,680

 
$
15,779

 
$
20,459

Additions

 
588

 
588

Amortization
(668
)
 
(520
)
 
(1,188
)
Balance, end of period
$
4,012

 
$
15,847

 
$
19,859

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)
2017
 
2016
Fair market value, beginning of period
$
18,087

 
$
18,345

Fair market value, end of period
17,627

 
17,195

Weighted average discount rate
9.5
%
 
9.5
%
Forecasted constant prepayment rate assumption
15.0

 
15.3

Schedule of estimated amortization expense
Based on the core deposit premium and mortgage servicing rights held as of March 31, 2017, estimated amortization expense for the remainder of fiscal year 2017, 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
2017 (remainder)
$
2,006

 
$
1,498

 
$
3,504

2018
2,006

 
1,673

 
3,679

2019

 
1,397

 
1,397

2020

 
1,191

 
1,191

2021

 
992

 
992

2022

 
893

 
893

Thereafter

 
8,203

 
8,203

 
$
4,012

 
$
15,847

 
$
19,859