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Goodwill and intangible assets
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and intangible assets
Goodwill and intangible assets:
The balance in goodwill at December 31, 2018 and 2017 was $137,190 and $137,190, respectively.
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. Goodwill impairment was neither indicated nor recorded during the year ended December 31, 2018 or the year ended December 31, 2017.
On July 31, 2017, the Company recorded $9,060 of core deposit intangibles resulting from the merger with the Clayton Banks, which is being amortized over a weighted average life of approximately 3 years.  Additionally, the Company recognized identifiable intangible assets related to favorable lease terms of $587, customer base trust intangible of $1,600, and manufactured housing loan servicing intangible of $1,088 as a result of the Clayton Banks acquisition, which are being amortized over estimated lives of 6.5 years, 10 years, and 5 years respectively.
Core deposit and other intangibles are as follows as of the indicated dates:
 
 
Core deposit and other intangibles
 
 
 
Gross Carrying Amount

 
Accumulated Amortization

 
Net Carrying Amount

December 31, 2018
 
 
 
 
 
 
Core deposit intangible
 
$
38,915

 
$
(29,901
)
 
$
9,014

Leasehold intangible
 
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

 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
 
 
Core deposit intangible
 
$
38,915

 
$
(27,121
)
 
$
11,794

Leasehold intangible
 
587

 
(38
)
 
549

Customer base trust intangible
 
1,600

 
(67
)
 
1,533

Manufactured housing servicing intangible
 
1,088

 
(62
)
 
1,026

Total core deposit and other intangibles
 
$
42,190

 
$
(27,288
)
 
$
14,902


Amortization expense for core deposit and other intangibles for the years ended December 31, 2018, 2017 and 2016 was $3,185, $1,995, and $2,132, respectively.
The estimated aggregate amortization expense of core deposit and other intangibles for each of the next five years and thereafter is as follows:
December 31, 2019
 
$
2,862

December 31, 2020
 
2,476

December 31, 2021
 
2,090

December 31, 2022
 
1,614

December 31, 2023
 
1,101

Thereafter
 
1,485

 
 
$
11,628