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Goodwill and Other Intangible Assets - Schedule of Changes in Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 5,236,302
Acquisitions	6,654
Other	1,729
Ending balance	5,244,685
CSB
Goodwill [Roll Forward]
Goodwill, Beginning Balance	4,915,857
Acquisitions	0
Other	(25)
Ending balance	4,915,832
Commercial
Goodwill [Roll Forward]
Goodwill, Beginning Balance	320,445
Acquisitions	6,654
Other	1,754
Ending balance	$ 328,853

X

- 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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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

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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