Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill by reporting unit

The following tables present changes in the carrying amount of goodwill by reporting unit during the three months ended March 31, 2019 and 2018:

($ in thousands)	Consumer and Business Banking			Commercial Banking		Total
Beginning balance, January 1, 2018	$	357,207		$	112,226	$	469,433
Disposition of the DCB branches	(3,886		)	—		(3,886		)
Ending balance, March 31, 2018	$	353,321		$	112,226	$	465,547

($ in thousands)	Consumer and Business Banking		Commercial Banking		Total
Beginning balance, January 1, 2019	$	353,321	$	112,226	$	465,547
Acquisition of Enstream Capital Markets, LLC	—		150		150
Ending balance, March 31, 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 March 31, 2019 and December 31, 2018:

($ in thousands)	March 31, 2019			December 31, 2018
Gross balance (1)	$	86,099		$	86,099
Accumulated amortization (1)	(72,744		)	(71,570		)
Net carrying balance (1)	$	13,355		$	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 March 31, 2019:

($ in thousands)	Amount
Remainder of 2019	$	3,344
2020	3,634
2021	2,749
2022	1,865
2023	1,199
Thereafter	564
Total	$	13,355