Contingencies - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Loss Contingencies [Line Items]
Unused commitments to extend credit	$ 4,361.0	$ 4,590.0
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Potential exposure to credit loss in the event of nonperformance	$ 136.4	126.6
Letters of credit, maturity term - maximum	3 years
Collateral held, fair value	$ 42.5	$ 26.4

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details