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Goodwill and Other Amortizing Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill Disclosure [Abstract]  
Summarized Other Intangible Assets
The following table summarizes other intangible assets:
 
Gross
Intangible
Assets
 
Accumulated
Amortization
 
Net
Intangible
Assets
 
(dollars in thousands)
December 31, 2017
 
 
 
 
 
Customer deposit intangibles
$
19,471

 
$
(6,071
)
 
$
13,400

Customer list intangible
$
2,283

 
$
(751
)
 
$
1,532

Total other intangible assets
$
21,754

 
$
(6,822
)
 
$
14,932

 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
Customer deposit intangibles
$
30,471

 
$
(18,998
)
 
$
11,473

Customer list intangible
$
984

 
$
(444
)
 
$
540

Total other intangible assets
$
31,455

 
$
(19,442
)
 
$
12,013
Estimated Amortization Expense of Core Deposit Intangibles
The following presents the estimated amortization expense of core deposit and customer list intangibles:
 
Core Deposit Intangibles
Customer List Intangible
Total
 
(dollars in thousands)
2018
$
2,714

$
318

$
3,032

2019
2,414

271

2,685

2020
2,062

230

2,292

2021
1,768

193

1,961

2022
1,473

159

1,632

Thereafter
2,969

361

3,330

Total
$
13,400

$
1,532

$
14,932