The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Goodwill and Other Intangible Assets - Summary of changes - (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Sep. 30, 2018	Nov. 30, 2017	Sep. 30, 2017	Jan. 03, 2017
Goodwill
Goodwill	$ 999,586		$ 1,002,900		$ 597,236
Southeastern Bank Financial
Goodwill
Goodwill						$ 258,295
Additions, Goodwill from acquisition or merger		$ 258,300
Core deposit intangible						$ 18,120
Park Sterling Corporation
Goodwill
Goodwill				$ 406,264
Additions, Goodwill from acquisition or merger	$ 406,300
Core deposit intangible				$ 29,496