Goodwill and Other Intangibles

9 Months Ended

Sep. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

6. Goodwill and Other Intangibles

Changes in the carrying amount of goodwill for the periods ended September 30, 2021 and December 31, 2020 by reportable segment are as follows (in thousands):

	Commercial Banking		Institutional Banking		Personal Banking			Total
Balances as of January 1, 2021	$	59,419	$	51,332	$	70,116		$	180,867
Sale of component of business segment		—		—		(6,349	)		(6,349	)
Balances as of September 30, 2021	$	59,419	$	51,332	$	63,767		$	174,518


Balances as of January 1, 2020	$	59,419	$	51,332	$	70,116		$	180,867
Balances as of December 31, 2020	$	59,419	$	51,332	$	70,116		$	180,867

The following table lists the finite-lived intangible assets that continue to be subject to amortization as of September 30, 2021 and December 31, 2020 (in thousands):

	As of September 30, 2021
	Core Deposit Intangible Assets		Customer Relationships		Total
Gross carrying amount	$	50,059	$	71,167	$	121,226
Accumulated amortization		49,445		56,255		105,700
Net carrying amount	$	614	$	14,912	$	15,526

	As of December 31, 2020
	Core Deposit Intangible Assets		Customer Relationships		Total
Gross carrying amount	$	50,059	$	89,928	$	139,987
Accumulated amortization		48,746		70,185		118,931
Net carrying amount	$	1,313	$	19,743	$	21,056

On March 31, 2021, the Company sold its membership interests in its Prairie Capital Management, LLC and UMB Merchant Banc, LLC subsidiaries, a component of its Personal Banking segment. The sale included disposition of $6.3 million of goodwill and $1.9 million of net unamortized customer relationship intangibles.

The following table has the aggregate amortization expense recognized in each period (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Aggregate amortization expense	$	1,110	$	1,524	$	3,647	$	4,916

The following table lists estimated amortization expense of intangible assets in future periods (in thousands):

For the three months ending December 31, 2021	$	1,110
For the year ending December 31, 2022		3,920
For the year ending December 31, 2023		3,323
For the year ending December 31, 2024		2,704
For the year ending December 31, 2025		2,608