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Intangible Assets - Summary Of Gross Goodwill And Accumulated Impairment Losses And Write-Offs Detailed By Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Goodwill [Line Items] |  |
Goodwill, Beginning balance | $ 1,432,787 | $ 1,386,853
Additions | 0 | 11,648
Goodwill, Ending balance | 1,432,787 | 1,398,501
Regional Banking |  |
Goodwill [Line Items] |  |
Goodwill, Beginning balance | 1,289,819 | 1,243,885
Additions | 0 | 11,648
Goodwill, Ending balance | 1,289,819 | 1,255,533
Fixed Income |  |
Goodwill [Line Items] |  |
Goodwill, Beginning balance | 142,968 | 142,968
Additions | 0 | 0
Goodwill, Ending balance | $ 142,968 | $ 142,968

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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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