Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of carrying amount of goodwill and other intangible assets

The carrying amount of goodwill and other intangible assets is summarized below as of the dates indicated (in thousands):

	December 31,
	2021		2020
Core deposit intangible	$	38,192	$	36,162
Less: accumulated amortization	(25,870)		(22,148)
Net core deposit intangible	12,322		14,014
Customer relationship intangible	8,400		—
Less: accumulated amortization	(322)		—
Net customer relationship intangible	8,078		—
Total intangibles subject to amortization, net	20,400		14,014
Goodwill	452,007		367,809
Total goodwill and other intangible assets, net	$	472,407	$	381,823

Schedule of changes in the carrying amounts of goodwill

The following is a summary of changes in the carrying amounts of goodwill for the years indicated (in thousands):

	Goodwill (1)
December 31, 2019	$	327,425
Acquisition of Three Shores	40,384
December 31, 2020	367,809
Acquisition of FinTrust	14,163
Acquisition of Aquesta	70,035
December 31, 2021	$	452,007

(1) Goodwill balances presented are shown net of accumulated impairment losses of $306 million incurred prior to 2019. Gross goodwill for December 31, 2021, 2020, and 2019 totaled $758 million, $673 million and $633 million, respectively.

Schedule of estimated aggregate amortization expense for future periods

The estimated aggregate amortization expense for future periods for finite lived intangibles is as follows (in thousands): 

Year
2022	$	4,081
2023	3,447
2024	2,849
2025	2,169
2026	1,709
Thereafter	6,145
Total	$	20,400