Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 690,637
Goodwill from business combinations	395,073
Goodwill, ending balance	1,085,710
Consumer Lending
Goodwill [Roll Forward]
Goodwill, beginning balance	200,103
Goodwill from business combinations	87,153
Goodwill, ending balance	287,256
Consumer Lending \| Wealth Management
Goodwill [Roll Forward]
Goodwill, beginning balance	21,218
Goodwill from business combinations	0
Goodwill, ending balance	21,218
Commercial Lending
Goodwill [Roll Forward]
Goodwill, beginning balance	316,258
Goodwill from business combinations	242,232
Goodwill, ending balance	558,490
Investment Management
Goodwill [Roll Forward]
Goodwill, beginning balance	153,058
Goodwill from business combinations	65,688
Goodwill, ending balance	$ 218,746

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.

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

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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