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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-Section 45
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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	Mar. 31, 2018	Nov. 30, 2017	Jan. 03, 2017
Goodwill
Goodwill, Ending Balance	$ 999,586	$ 595,711
Southeastern Bank Financial
Goodwill
Additions, Goodwill from acquisition or merger		$ 258,300
Core deposit intangible					$ 18,120
Park Sterling Corporation
Goodwill
Additions, Goodwill from acquisition or merger	$ 403,000
Core deposit intangible			$ 26,200	$ 26,175