Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

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 and 2018:

($ in thousands)	Consumer and Business Banking			Commercial Banking		Total
Balance, January 1, 2018	$	357,207		$	112,226	$	469,433
Disposition of the DCB branches	(3,886		)	—		(3,886		)
Balance, September 30, 2018	$	353,321		$	112,226	$	465,547
Balance, January 1, 2019	$	353,321		$	112,226	$	465,547
Acquisition of Enstream Capital Markets, LLC	—			150		150
Balance, September 30, 2019	$	353,321		$	112,376	$	465,697

Schedule of gross carrying value 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, 2019 and December 31, 2018:

($ in thousands)	September 30, 2019			December 31, 2018
Gross balance (1)	$	86,099		$	86,099
Accumulated amortization (1)	(75,044		)	(71,570		)
Net carrying balance (1)	$	11,055		$	14,529

(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, 2019:

($ in thousands)	Amount
Remainder of 2019	$	1,044
2020	3,634
2021	2,749
2022	1,865
2023	1,199
Thereafter	564
Total	$	11,055