Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

The following table presents the gross carrying value of core deposit intangible assets and accumulated amortization as of December 31, 2017 and 2016:

($ in thousands)	December 31,
	2017			2016
Gross balance	$	108,814		$	108,814
Accumulated amortization	(87,760		)	(80,825		)
Net carrying balance	$	21,054		$	27,989

Schedule of estimated future amortization expense of the core deposit intangibles

The following table presents the estimated future amortization expense of core deposit intangibles for the five years succeeding December 31, 2017 and thereafter:

($ in thousands)	Amount
2018	$	5,883
2019	4,864
2020	3,846
2021	2,833
2022	1,865
Thereafter	1,763
Total	$	21,054