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Loans and Allowance for Credit Losses - Additional information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) loan	Sep. 30, 2023 USD ($) loan	Sep. 30, 2024 USD ($) loan	Sep. 30, 2023 USD ($) loan	Dec. 31, 2023 USD ($)
Loans and Allowance for Credit Losses
Accrued interest receivable on loans	$ 10.0		$ 10.0		$ 11.8
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable		Interest Receivable		Interest Receivable
Number of loans modified | loan	0	0	0	1
Aggregate outstanding balances of troubled debt restructurings		$ 9.6		$ 9.6
Forgiveness of principal			$ 0.0

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Number of financing receivables that have been modified by troubled debt restructurings.

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Amount, after allowance for credit loss, of accrued interest on financing receivable.

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Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

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