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Goodwill and intangible assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and intangible assets
Goodwill and intangible assets:
The following table summarizes changes in goodwill during the year ended December 31, 2019. There was no such activity during the year ended December 31, 2018.
 
 
Goodwill

Balance at December 31, 2018
 
$
137,190

Addition from acquisition of Atlantic Capital branches (see Note 2)
 
31,961

Relief due to sale of third party origination ("TPO") mortgage delivery channel
 
(100
)
Balance at December 31, 2019
 
$
169,051


Goodwill relief of $100 for the year ended December 31, 2019 is related to goodwill assigned to the third party origination channel in the Mortgage segment, which was sold during the year ended December 31, 2019.
Goodwill is tested annually, or more often if circumstances warrant, for impairment. If the implied fair value of goodwill is lower than its carrying amount, goodwill impairment is indicated and is written down to its implied fair value. Subsequent increases in goodwill values are not recognized in the financial statements. No impairment was indicated in the Company's goodwill impairment analysis for the years ended December 31, 2019 or 2018.
Core deposit and other intangibles include core deposit intangibles, customer base trust intangible and manufactured housing servicing intangible. The composition of core deposit and other intangibles as of December 31, 2019 and 2018 are as follows:
 
 
Core deposit and other intangibles
 
 
 
Gross Carrying Amount

 
Accumulated Amortization

 
Net Carrying Amount

December 31, 2019
 
 
 
 
 
 
Core deposit intangible
 
$
49,675

 
$
(33,861
)
 
$
15,814

Customer base trust intangible
 
1,600

 
(387
)
 
1,213

Manufactured housing servicing intangible
 
1,088

 
(526
)
 
562

Total core deposit and other intangibles
 
$
52,363

 
$
(34,774
)
 
$
17,589

 
 
 
 
 
 
 
December 31, 2018
 
 
 
 
 
 
Core deposit intangible
 
$
38,915

 
$
(29,901
)
 
$
9,014

Leasehold intangible(1)
 
587

 
(127
)
 
460

Customer base trust intangible
 
1,600

 
(227
)
 
1,373

Manufactured housing servicing intangible
 
1,088

 
(307
)
 
781

Total core deposit and other intangibles
 
$
42,190

 
$
(30,562
)
 
$
11,628

(1) In conjunction with the adoption of ASU 2016-02 "Leases" (Topic 842) on January 1, 2019, the Company reclassified leasehold intangibles from core deposit and other intangibles to operating lease right-of-use assets on the Consolidated balance sheets. See Note 9. Leases for additional discussion.
During the second quarter of 2019, the Company recorded $10,760 of core deposit intangibles resulting from the Atlantic Capital branch acquisition, which is being amortized over a weighted average life of approximately 6 years.
Amortization expense for core deposit and other intangibles for the years ended December 31, 2019, 2018 and 2017 was $4,339, $3,185, and $1,995, respectively.
The estimated aggregate future amortization expense of core deposit and other intangibles is as follows:
December 31, 2020
 
$
4,262

December 31, 2021
 
3,663

December 31, 2022
 
2,972

December 31, 2023
 
2,247

December 31, 2024
 
1,737

Thereafter
 
2,708

 
 
$
17,589