Goodwill represents the excess of the consideration paid over the fair value of the net assets acquired or the excess of the fair value of the net liabilities assumed over the consideration received in a business combination. The carrying amount of goodwill was $855.5 million at both December 31, 2021 and 2020.

The Company completed its annual impairment test of goodwill as of September 30, 2021 by performing a qualitative (“Step Zero”) assessment. The qualitative assessment involved the examination of changes in macroeconomic conditions, industry and market conditions, overall financial performance, cost factors and other relevant entity-specific events, including changes in management and other key personnel and changes in the share price of the Company’s common stock. As a result of the assessment, the Company concluded that its goodwill was not impaired.

In the fourth quarter of 2020, the Company completed its annual test of impairment as of September 30, 2020 using multiple approaches to measure the fair value of the reporting unit and concluded there was no impairment. These methods included an income approach using the discounted net present value of estimated future cash flows and three market approaches using transaction or price-to-forward earnings multiples, price to tangible book value methodologies using the actual price paid in recent acquisition transactions for similar entities and a market capitalization approach using the Company’s stock price observed during the fourth quarter. The results from each of the approaches were weighted equally, with the valuation of the reporting unit approximately 17% in excess of net book value at September 30, 2020. Individually, no valuation method resulted in estimated fair value less than the Company’s carrying value.

No goodwill impairment charges were recognized during the years ended December 31, 2021, 2020 or 2019.

Identifiable intangible assets with finite lives are amortized over the periods benefited and are evaluated for impairment similar to other long-lived assets. The purchase and carrying values of intangible assets subject to amortization at December 31, 2021 and 2020 were as follows:

	December 31, 2021
	Purchase		Accumulated		Carrying
(in thousands)	Value		Amortization		Value
Core deposit intangibles	$	235,845	$	188,135	$	47,710
Credit card and trust relationships		49,962		27,446		22,516
	$	285,807	$	215,581	$	70,226

	December 31, 2020
	Purchase		Accumulated		Carrying
(in thousands)	Value		Amortization		Value
Core deposit intangibles	$	235,845	$	173,830	$	62,015
Credit card and trust relationships		49,962		25,085		24,877
Merchant processing relationships		10,000		10,000		—
	$	295,807	$	208,915	$	86,892

Aggregate amortization expense by category of finite lived intangible assets for the years ended December 31, 2021, 2020, and 2019 is as follows:

	Years Ended December 31,
(in thousands)	2021		2020		2019
Core deposit intangibles	$	14,304	$	16,864	$	17,132
Credit card and trust relationships		2,361		2,637		2,883
Merchant processing relationships		—		415		829
	$	16,665	$	19,916	$	20,844

At December 31, 2021, the weighted-average remaining life of core deposit intangibles was approximately 9 years, and the weighted-average remaining life of other identifiable intangibles was approximately 14 years.

The following table shows estimated amortization expense of other intangible assets at December 31, 2021 for the five succeeding years and all years thereafter, calculated based on current amortization schedules.

(in thousands)
2022	$	14,033
2023		11,557
2024		9,413
2025		7,985
2026		5,322
Thereafter		21,916
	$	70,226