Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill by reporting unit

The following table presents changes in the carrying amount of goodwill by reporting unit during years ended December 31, 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, December 31, 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, December 31, 2019	$	353,321		$	112,376	$	465,697

Schedule 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 December 31, 2019 and 2018:

($ in thousands)	December 31,
	2019			2018
Gross balance (1)	$	86,099		$	86,099
Accumulated amortization (1)	(76,088		)	(71,570		)
Net carrying balance (1)	$	10,011		$	14,529

(1) Excludes fully amortized core deposit intangible assets.

Schedule of estimated future amortization expense of the core deposit intangibles

The following table presents the estimated future amortization expense of core deposit intangibles as of December 31, 2019:

($ in thousands)	Amount
2020	$	3,634
2021	2,749
2022	1,865
2023	1,199
2024	553
Thereafter	11
Total	$	10,011