Goodwill and intangible assets (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

The following table summarizes changes in goodwill during the nine months ended September 30, 2019. There was no such activity during the nine months ended September 30, 2018.



	Goodwill
Balance at December 31, 2018	$	137,190
Addition from acquisition of Atlantic Capital branches (see Note 2)	31,396
Impairment due to sale of third party origination ("TPO") mortgage delivery channel	(100		)
Balance at September 30, 2019	$	168,486

Schedule of Core Deposit and Other Intangibles

The change in core deposit and other intangibles during the three and nine months ended September 30, 2019 and 2018 is as follows:



	Core deposit and other intangibles
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2019			2018			2019			2018
Beginning Balance	$	19,945		$	13,203		$	11,628		$	14,902
Addition of core deposit intangible from acquisition of Atlantic Capital branches (see Note 2)	—			—			10,760			—
Reclassification of leasehold intangible⁽¹⁾	—			—			(460		)	—
Less: amortization expense⁽²⁾	(1,197		)	(800		)	(3,180		)	(2,499		)
Ending Balance	$	18,748		$	12,403		$	18,748		$	12,403

(1) The Company adopted ASU 2016-02 "Leases" (Topic 842) on January 1, 2019 and reclassified $460 of leasehold intangibles to Operating lease right-of-use asset.

(2) The three and nine months ended September 30, 2018 includes $23 and $67, respectively, of amortization expense related to leasehold intangibles included in occupancy and equipment expense.

Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles

The estimated aggregate future amortization expense of the core deposit and other intangibles is as follows:



Remainder of 2019	$	1,159
December 31, 2020	4,262
December 31, 2021	3,663
December 31, 2022	2,973
December 31, 2023	2,247
Thereafter	4,444
	$	18,748