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Loans and Investments - Non-performing Loans (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) loan	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) loan	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loans and Investments
Number of loans | loan	789		747
Interest income recognized on nonaccrual loans	$ 21,600	$ 2,800
Loans and investments, allowance for credit losses	$ 243,588	$ 184,069	$ 195,664	$ 238,923	$ 169,054	$ 132,559
Six loans collateralized by a land development project
Loans and Investments
Number of loans with unpaid principal balance | loan	6
Unpaid principal balance on loans	$ 121,400
Five loans collateralized by a land development project
Loans and Investments
Number of loans with unpaid principal balance | loan	5
Unpaid principal balance on loans	$ 112,100
Weighted average accrual rate of interest (as a percent)	10.36%
Loans collateralized by a land development project
Loans and Investments
Loans and investments, allowance for credit losses	$ 71,400		$ 71,400
Non-performing loans
Loans and Investments
Number of loans | loan	26		16
Carrying value of loans	$ 557,000		$ 235,600
Loan loss reserves	37,300		27,100
Non-performing loans | Financial Asset, Greater Than 60 Days Past Due
Loans and Investments
Interest receivable	$ 0		$ 0

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Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 210
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-Subsection 29
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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
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Amount of interest income on financing receivable on nonaccrual status.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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