Mortgage Notes Receivable - Information pertaining to mortgage notes receivable (Details) - USD ($) $ in Thousands		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Construction holdbacks		$ 22,800
Total principal outstanding for our mortgage notes receivable held for investment		923,442	[1]	$ 911,744	[2]
Adoption of ASU 2016-13		41,492	[1],[3],[4]	10,394	[2],[5],[6]
Mortgage notes receivable held for investment, net		881,950		901,350
Mortgage notes receivables
Loans and Leases Receivable Disclosure [Line Items]
Total loan commitments		1,417,325		1,489,055
Construction holdbacks	[7]	452,690		524,462
Interest reserves		33,633		39,880
Total principal outstanding for our mortgage notes receivable held for investment		931,002		924,713
Adoption of ASU 2016-13	[8]	41,492		10,394
Deferred origination and amendment fees		7,560		12,969
Mortgage notes receivable held for investment, net		881,950		901,350
Broadmark Private REIT, LLC
Loans and Leases Receivable Disclosure [Line Items]
Construction holdbacks				17,300
Unfunded Loan Commitment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Adoption of ASU 2016-13	[9]	1,474		904		$ 0
Unfunded Loan Commitment [Member] | Accounts payable and accrued liabilities
Loans and Leases Receivable Disclosure [Line Items]
Adoption of ASU 2016-13		1,500		900
Funded And Unfunded Loan Commitment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Adoption of ASU 2016-13		$ 42,966		$ 11,298		$ 10,590

[1] 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.

[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 ensure successful completion of the construction and return of capital.

[3] 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.

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

[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] 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.

[7] As of December 31, 2022 and 2021 this amount includes $22.8 and $17.3 million, respectively, of construction holdbacks for defaulted loans that we are no longer required to pay. These amounts are included in the loan commitment totals.

[8] As of December 31, 2022 and 2021, $1.5 and $0.9 million, respectively, 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.

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