Mortgage Notes Receivable - Schedule reconciles outstanding mortgage loan commitments to the outstanding balance of recevable (Parenthetical) (Details) - USD ($) $ in Thousands		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Construction Hold Backs		$ 22,800
Financing Receivable, Allowance for Credit Loss		$ 41,492	[1],[2],[3]	$ 10,394	[4],[5],[6]
Debt, Weighted Average Interest Rate		0.04%
Unfunded Loan Commitment [Member]
Defined Benefit Plan Disclosure [Line Items]
Financing Receivable, Allowance for Credit Loss	[7]	$ 1,474		904		$ 0
LTV [Member]
Defined Benefit Plan Disclosure [Line Items]
Debt, Weighted Average Interest Rate		124.80%
Accounts payable and accrued liabilities | Unfunded Loan Commitment [Member]
Defined Benefit Plan Disclosure [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 1,500		900
Broadmark Private Reit Llc [Member]
Defined Benefit Plan Disclosure [Line Items]
Construction Hold Backs				$ 17,300

[1] Includes $35.0 million in loan specific allowances for loans deemed collateral dependent based on the excess amortized cost over the fair value of the underlying collateral. In addition, $1.5 million of the CECL allowance is excluded from this table because it relates to unfunded commitments and has been recorded as a liability under accounts payable and accrued liabilities in our consolidated balance sheet.

[2] Represents LTV as of origination or latest amendment. LTVs above 65% generally represent loans in contractual default status where we have agreed to extend funds to the borrower above 65% in order to facilitate successful completion of the construction and return of capital.

[3] Represents the year of either origination or amendment where the loan incurred a full re-underwriting in connection with the amendment.

[4] Includes $0.7 million in loan specific allowances for loans deemed collateral dependent based on the excess amortized cost over the fair value of the underlying collateral. In addition, $0.9 million of the CECL allowance is excluded from this table because it relates to unfunded commitments and has been recorded as a liability under accounts payable and accrued liabilities in our consolidated balance sheet.

[5] Includes $0.7 million in loan specific allowances for loans deemed collateral dependent based on the excess amortized cost over the fair value of the underlying collateral. In addition, $0.9 million of the CECL allowance is excluded from this table because it relates to unfunded commitments and has been recorded as a liability under accounts payable and accrued liabilities in our consolidated balance sheet.

[6] Represents LTV as of origination or latest amendment. LTVs above 65% generally represent loans in contractual default status where we have agreed to extend funds to the borrower above 65% in order to ensure successful completion of the construction and return of capital.

[7] CECL allowance related to unfunded commitments is presented as a liability under accounts payable and accrued liabilities in our consolidated balance sheet.