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Significant Accounting Policies - Variable Interest Entity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 11, 2025	Dec. 31, 2024
Variable Interest Entity
Assets	$ 484,397		$ 491,976
Liabilities	308,779		$ 310,325
Sachem Capital Corporation Holdings, LLC
Variable Interest Entity
Assets	206,800
Liabilities	92,600
Senior Secured Notes due June 11, 2030 | Senior Notes | Sachem Capital Corporation Holdings, LLC
Variable Interest Entity
Principal amount		$ 100,000
SN Holdings LLC
Variable Interest Entity
Assets	90,600
Liabilities	$ 36,000

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