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Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Investment in equity securities, at fair value	$ 21,918,000		$ 21,918,000		$ 0
Amortization of unrealized gain on debt securities available-for-sale transferred to held-to-maturity	770,000	$ 987,000	2,335,000	$ 4,159,000
Gain (loss) on securities held at fair value	900,000	0	900,000	0
Securities retained, value		57,900,000		16,100,000
Securities past due	0		0		$ 0
Beneficial interest, accretable yield	2,400,000	1,900,000	3,800,000	6,000,000.0
Held-to-maturity securities, accretable yield	300,000	500,000	$ 1,100,000	1,700,000
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Unpaid principal balance	110,000,000
Debt securities available-for-sale, at fair value
Debt Securities, Available-for-sale [Line Items]
Unpaid principal balance	$ 62,700,000
Senior notes
Debt Securities, Available-for-sale [Line Items]
Debt securities, realized loss		$ 400,000		$ 3,300,000

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