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Goodwill and intangible assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
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
Schedule of Core Deposit and Other Intangibles
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.
Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles
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