Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in the carrying amount of goodwill by reporting unit

The following table presents changes in the carrying amount of goodwill by reporting unit during the nine months ended September 30, 2019:

($ in thousands)	Consumer and Business Banking		Commercial Banking		Total
Beginning balance, January 1, 2019	$	353,321	$	112,226	$	465,547
Acquisition of East West Markets, LLC	—		150		150
Ending balance, September 30, 2019	$	353,321	$	112,376	$	465,697

Schedule of gross carrying amount of core deposit intangible assets and accumulated amortization

The following table presents the gross carrying amount of core deposit intangible assets and accumulated amortization as of September 30, 2020 and December 31, 2019:

($ in thousands)	September 30, 2020		December 31, 2019
Gross balance (1)	$	86,099	$	86,099
Accumulated amortization (1)	(78,899)		(76,088)
Net carrying balance (1)	$	7,200	$	10,011

(1)Excludes fully amortized core deposit intangible assets.

Schedule of estimated future amortization expense of core deposit intangibles

The following table presents the estimated future amortization expense of core deposit intangibles as of September 30, 2020:

($ in thousands)	Amount
Remainder of 2020	$	823
2021	2,749
2022	1,865
2023	1,199
2024	553
Thereafter	11
Total	$	7,200