Goodwill and Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill by segment

The table below illustrates goodwill by segment for the years ended December 31, 2016 and 2015 ($ in thousands):

	General
	Banking		Insurance		Total
Balance as of January 1, 2015	$	321,132	$	44,368	$	365,500
Goodwill from purchase of insurance book of business during 2015		—		656		656
Balance as of December 31, 2015		321,132		45,024		366,156
Adjustment during 2016		—		—		—
Balance as of December 31, 2016	$	321,132	$	45,024	$	366,156

Schedule of identifiable intangible assets

At December 31, 2016 and 2015, identifiable intangible assets consisted of the following ($ in thousands):

	December 31, 2016						December 31, 2015
	GrossCarrying		Accumulated		Net Carrying		Gross Carrying		Accumulated		Net Carrying
	Amount		Amortization		Amount		Amount		Amortization		Amount
Core deposit intangibles	$	85,824	$	67,843	$	17,981	$	85,824	$	61,603	$	24,221
Insurance intangibles		13,824		11,615		2,209		13,824		11,117		2,707
Banking charters		1,325		877		448		1,325		811		514
Borrower relationship intangible		690		648		42		690		586		104
Total	$	101,663	$	80,983	$	20,680	$	101,663	$	74,117	$	27,546

The following table illustrates the carrying amounts and remaining weighted-average amortization periods of identifiable intangible assets as of December 31, 2016 ($ in thousands):

			Remaining
			Weighted-
			Average
	Net Carrying		Amortization
	Amount		Period in Years
Core deposit intangibles	$	17,981		5.6
Insurance intangibles		2,209		15.1
Banking charters		448		6.7
Borrower relationship intangible		42		0.6
Total	$	20,680		6.6