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Borrowings - Narrative (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Bank Term Funding Program
Debt Instrument [Line Items]
Aggregate availability under federal funds line	$ 484.9
Federal Funds Purchased
Debt Instrument [Line Items]
Aggregate availability under federal funds line	$ 1,700.0	$ 1,700.0

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