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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Tables)
3 Months Ended
Mar. 31, 2018
OTHER INTANGIBLE ASSETS  
Schedule of gross carrying value and accumulated amortization related to intangible assets
The following table presents changes in core deposit premium and mortgage servicing rights for the three months ended March 31, 2018:
 
(dollars in thousands)
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
Balance, beginning of period
$
2,006

 
$
15,843

 
$
17,849

Additions

 
435

 
435

Amortization
(669
)
 
(457
)
 
(1,126
)
Balance, end of period
$
1,337

 
$
15,821

 
$
17,158

The gross carrying value and accumulated amortization related to our core deposit premium and mortgage servicing rights are presented below:
 
 
March 31, 2018
 
December 31, 2017
(dollars in thousands)
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
Core deposit premium
$
44,642

 
$
(43,305
)
 
$
1,337

 
$
44,642

 
$
(42,636
)
 
$
2,006

Mortgage servicing rights
64,836

 
(49,015
)
 
15,821

 
64,401

 
(48,558
)
 
15,843

Total
$
109,478

 
$
(92,320
)
 
$
17,158

 
$
109,043

 
$
(91,194
)
 
$
17,849

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:
 
(dollars in thousands)
March 31, 2018
 
March 31, 2017
Fair market value, beginning of period
$
17,161

 
$
18,087

Fair market value, end of period
18,463

 
17,627

Weighted average discount rate
9.5
%
 
9.5
%
Forecasted constant prepayment rate assumption
14.2

 
15.0

Schedule of estimated amortization expense
Based on the core deposit premium and mortgage servicing rights held as of March 31, 2018, estimated amortization expense for the remainder of fiscal year 2018, 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
2018 (remainder)
$
1,337

 
$
1,076

 
$
2,413

2019

 
1,211

 
1,211

2020

 
1,017

 
1,017

2021

 
867

 
867

2022

 
733

 
733

2023

 
663

 
663

Thereafter

 
10,254

 
10,254

 
$
1,337

 
$
15,821

 
$
17,158