| Cover - USD ($) $ in Billions | 12 Months Ended | ||
| Dec. 31, 2022 | Feb. 22, 2023 | Jun. 30, 2022 | |
| Document Information [Line Items] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Amendment Description | Broadmark Realty Capital Inc. (“Broadmark Realty,” “the “Company,” “we,” “us” or “our”) a Maryland corporation, is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to amend our Annual Report on Form 10-K for the year ended December 31, 2022, originally filed with the Securities and Exchange Commission (the “SEC”) on March 1, 2023 (the “Original Form 10-K”), to include the information required by Items 10 through 14 of Part III of Form 10-K. Capitalized terms used but not otherwise defined in this Amendment shall have the same meanings given to them in the Original Form 10-K. This information was previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K, which permits the information in the above referenced items to be incorporated in the Form 10-K by reference from our definitive proxy statement if such statement is filed no later than 120 days after the end of our fiscal year. We are filing this Amendment to include Part III information in our Form 10-K because a definitive proxy statement containing such information will not be filed by the Company within 120 days after the end of the fiscal year covered by the Form 10-K. | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Dec. 31, 2022 | ||
| Document Fiscal Period Focus | FY | ||
| Document Fiscal Year Focus | 2022 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity File Number | 001-39134 | ||
| Entity Registrant Name | Broadmark Realty Capital Inc. | ||
| Entity Central Index Key | 0001784797 | ||
| Entity Tax Identification Number | 84-2620891 | ||
| Entity Incorporation, State or Country Code | MD | ||
| Entity Address, Address Line One | 1420 Fifth Avenue | ||
| Entity Address, Address Line Two | Suite 2000 | ||
| Entity Address, City or Town | Seattle | ||
| Entity Address, State or Province | WA | ||
| Entity Address, Postal Zip Code | 98101 | ||
| City Area Code | 206 | ||
| Local Phone Number | 971-0800 | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 0.9 | ||
| Entity Common Stock, Shares Outstanding | 131,749,957 | ||
| ICFR Auditor Attestation Flag | true | ||
| Auditor Name | Moss Adams LLP | ||
| Auditor Location | Everett, Washington | ||
| Auditor Firm ID | 659 | ||
| Common Stock [Member] | |||
| Document Information [Line Items] | |||
| Title of 12(b) Security | Common Stock, par value $0.001 per share | ||
| Trading Symbol | BRMK | ||
| Security Exchange Name | NYSE | ||
| Warrant [Member] | |||
| Document Information [Line Items] | |||
| Title of 12(b) Security | Warrants, each exercisable for one fourth (1/4th) share of Common Stock at an exercise price of $2.875 per one fourth (1/4th)share | ||
| Trading Symbol | BRMK WS | ||
| Security Exchange Name | NYSEAMER |
