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OTHER INTANGIBLE ASSETS (Tables)
 6 Months Ended
Jun. 30, 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 core deposit premium and mortgage servicing rights are presented below:
 
 
June 30, 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

 
$
(41,299
)
 
$
3,343

 
$
44,642

 
$
(39,962
)
 
$
4,680

Mortgage servicing rights
63,269

 
(47,337
)
 
15,932

 
62,049

 
(46,270
)
 
15,779

Total
$
107,911

 
$
(88,636
)
 
$
19,275

 
$
106,691

 
$
(86,232
)
 
$
20,459

The following table presents changes in core deposit premium and mortgage servicing rights for the six months ended June 30, 2017:
 
(dollars in thousands)
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
Balance, beginning of period
$
4,680

 
$
15,779

 
$
20,459

Additions
—

 
1,220

 
1,220

Amortization
(1,337
)
 
(1,067
)
 
(2,404
)
Balance, end of period
$
3,343

 
$
15,932

 
$
19,275
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)
2017
 
2016
Fair market value, beginning of period
$
18,087

 
$
18,345

Fair market value, end of period
17,024

 
16,123

Weighted average discount rate
9.5
%
 
9.5
%
Forecasted constant prepayment rate assumption
16.1

 
16.5
Schedule of estimated amortization expense
Based on the core deposit premium and mortgage servicing rights held as of June 30, 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)
$
1,337

 
$
1,293

 
$
2,630

2018
2,006

 
2,148

 
4,154

2019
—

 
1,767

 
1,767

2020
—

 
1,448

 
1,448

2021
—

 
1,201

 
1,201

2022
—

 
1,039

 
1,039

Thereafter
—

 
7,036

 
7,036

 
$
3,343

 
$
15,932

 
$
19,275