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OTHER INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in other intangible assets
The following table presents changes in our core deposit premium and mortgage servicing rights for the periods presented:
 
 
Core
Deposit
Premium
 
Mortgage
Servicing
Rights
 
Total
 
(Dollars in thousands)
Balance as of December 31, 2016
$
4,680

 
$
15,779

 
$
20,459

Additions
—

 
2,352

 
2,352

Amortization
(2,674
)
 
(2,288
)
 
(4,962
)
Balance as of December 31, 2017
$
2,006

 
$
15,843

 
$
17,849

Additions
—

 
1,612

 
1,612

Amortization
(2,006
)
 
(1,859
)
 
(3,865
)
Balance as of December 31, 2018
$
—

 
$
15,596

 
$
15,596

Additions
—

 
1,582

 
1,582

Amortization
—

 
(2,460
)
 
(2,460
)
Balance as of December 31, 2019
$
—

 
$
14,718

 
$
14,718
Schedule of gross carrying value and accumulated amortization related to intangible assets
The gross carrying value, accumulated amortization, and net carrying value related to our core deposit premium and mortgage servicing rights as of December 31, 2019 and 2018 are presented below:
 
 
December 31, 2019
 
December 31, 2018
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
(Dollars in thousands)
Core deposit premium
$
44,642

 
$
(44,642
)
 
$
—

 
$
44,642

 
$
(44,642
)
 
$
—

Mortgage servicing rights
67,595

 
(52,877
)
 
14,718

 
66,013

 
(50,417
)
 
15,596

Total
$
112,237

 
$
(97,519
)
 
$
14,718

 
$
110,655

 
$
(95,059
)
 
$
15,596
Schedule of estimated amortization expense ased on our mortgage servicing rights held as of December 31, 2019, estimated amortization expense for the next five succeeding fiscal years and all years thereafter are as follows (dollars in thousands):
 
Year Ending December 31:
 
2020
$
2,407

2021
1,964

2022
1,635

2023
1,382

2024
1,154

Thereafter
6,176

Total
$
14,718
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:
 
 
Year Ended December 31,
 
2019
 
2018
 
(Dollars in thousands)
Fair market value, beginning of period
$
17,696

 
$
17,161

Fair market value, end of period
15,820

 
17,696

Weighted average discount rate
9.5
%
 
9.5
%
Weighted average prepayment speed assumption
14.2
%
 
14.5
%