Goodwill and Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill by segment

The table below illustrates goodwill by segment for the years ended December 31, 2017 and 2016 ($ in thousands):

	General
	Banking		Insurance		Total
Balance as of January 1, 2016	$	321,132	$	45,024	$	366,156
Adjustment during 2016		—		—		—
Balance as of December 31, 2016		321,132		45,024		366,156
Goodwill from Reliance merger during 2017		13,471		—		13,471
Balance as of December 31, 2017	$	334,603	$	45,024	$	379,627

Schedule of identifiable intangible assets

At December 31, 2017 and 2016, identifiable intangible assets consisted of the following ($ in thousands):

	December 31, 2017						December 31, 2016
	GrossCarrying		Accumulated		Net Carrying		Gross Carrying		Accumulated		Net Carrying
	Amount		Amortization		Amount		Amount		Amortization		Amount
Core deposit intangibles	$	87,674	$	73,494	$	14,180	$	85,824	$	67,843	$	17,981
Insurance intangibles		13,824		12,026		1,798		13,824		11,615		2,209
Banking charters		1,325		943		382		1,325		877		448
Borrower relationship intangible		690		690		—		690		648		42
Total	$	103,513	$	87,153	$	16,360	$	101,663	$	80,983	$	20,680

The following table illustrates the carrying amounts and remaining weighted-average amortization periods of identifiable intangible assets as of December 31, 2017 ($ in thousands):

			Remaining
			Weighted-
			Average
	Net Carrying		Amortization
	Amount		Period inYears
Core deposit intangibles	$	14,180		5.2
Insurance intangibles		1,798		15.3
Banking charters		382		5.7
Total	$	16,360		6.3