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Goodwill and Core Deposit Intangibles - Goodwill Carrying Value (Details) $ in Millions	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Net carrying value at beginning of the period	$ 1,100.9
Net carrying value at end of period	$ 1,100.9

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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