$BXMT
BLACKSTONE MORTGAGE TRUST, INC. Stock $bxmt

$bxmt Overview Financials Valuation SEC Filings Company Website

2021 Form 10-K Financial Statement

#000106163022000016 Filed on February 09, 2022

Income Statement

Concept	2021	2020 Q4	2020
Revenue	$854.7M	$188.9M	$779.6M
YoY Change	9.63%	-14.43%	-11.67%
Cost Of Revenue	$428.7M	$98.56M	$425.4M
YoY Change	0.78%	-11.21%	-7.22%
Gross Profit	$426.0M	$90.29M	$354.3M
YoY Change	20.25%	-17.69%	-16.49%
Gross Profit Margin	49.84%	47.81%	45.44%
Selling, General & Admin	$39.41M	$10.75M	$41.86M
YoY Change	-5.85%	-63.07%	-63.38%
% of Gross Profit	9.25%	11.9%	11.82%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization
YoY Change
% of Gross Profit
Operating Expenses	$43.17M	$11.55M	$45.87M
YoY Change	-5.89%	-61.5%	-60.89%
Operating Profit	$382.8M	$78.74M	$308.4M
YoY Change	24.14%	-1.2%	0.49%
Interest Expense	$340.2M		$347.5M
YoY Change	-2.1%		-24.21%
% of Operating Profit	88.86%		112.68%
Other Income/Expense, Net
YoY Change
Pretax Income	$422.7M	$84.55M	$140.7M
YoY Change	200.34%	6.22%	-54.14%
Income Tax	$423.0K	$131.0K	$323.0K
% Of Pretax Income	0.1%	0.15%	0.23%
Net Earnings	$419.2M	$83.62M	$137.7M
YoY Change	204.49%	5.98%	-54.95%
Net Earnings / Revenue	49.05%	44.28%	17.66%
Basic Earnings Per Share	$2.77		$0.97
Diluted Earnings Per Share	$2.77	$569.9K	$0.97
COMMON SHARES
Basic Shares Outstanding	151.5M shares		141.8M shares
Diluted Shares Outstanding	151.5M shares		141.8M shares

Balance Sheet

Concept	2021	2020 Q4	2020
SHORT-TERM ASSETS
Cash & Short-Term Investments	$551.2M	$290.0M	$290.0M
YoY Change	90.07%	93.31%	93.31%
Cash & Equivalents	$551.2M	$290.0M	$290.0M
Short-Term Investments
Other Short-Term Assets	$78.58M	$74.57M	$74.57M
YoY Change	5.37%	46.22%	46.22%
Inventory
Prepaid Expenses
Receivables	$86.10M	$66.76M	$66.76M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$715.8M	$431.3M	$431.3M
YoY Change	65.97%	60.93%	60.93%
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$78.08M	$77.45M	$77.45M
YoY Change	0.82%	-10.98%	-10.98%
Other Assets
YoY Change
Total Long-Term Assets	$21.99B	$16.53B	$16.53B
YoY Change	33.03%	1.5%	1.5%
TOTAL ASSETS
Total Short-Term Assets	$715.8M	$431.3M	$431.3M
Total Long-Term Assets	$21.99B	$16.53B	$16.53B
Total Assets	$22.70B	$16.96B	$16.96B
YoY Change	33.87%	2.46%	2.46%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$9.046M	$2.671M	$2.671M
YoY Change	238.67%	-46.58%	-46.58%
Accrued Expenses	$58.22M	$39.71M	$39.71M
YoY Change	46.64%	-11.76%	-11.76%
Deferred Revenue
YoY Change
Short-Term Debt	$6.263M	$0.00	$10.03M
YoY Change	-37.56%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$177.8M	$133.4M	$143.4M
YoY Change	23.98%	-0.46%	7.02%
LONG-TERM LIABILITIES
Long-Term Debt	$17.85B	$12.85B	$12.85B
YoY Change	38.91%	2.08%	2.08%
Other Long-Term Liabilities	$53.55M	$68.95M	$58.92M
YoY Change	-9.1%	64.16%	40.27%
Total Long-Term Liabilities	$17.91B	$12.92B	$12.91B
YoY Change	38.69%	2.28%	2.2%
TOTAL LIABILITIES
Total Short-Term Liabilities	$177.8M	$133.4M	$143.4M
Total Long-Term Liabilities	$17.91B	$12.92B	$12.91B
Total Liabilities	$18.12B	$13.05B	$13.07B
YoY Change	38.57%	2.08%	2.22%
SHAREHOLDERS EQUITY
Retained Earnings		-$829.3M
YoY Change
Common Stock		$4.704B
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.588B	$3.886B	$3.886B
YoY Change
Total Liabilities & Shareholders Equity	$22.70B	$16.96B	$16.96B
YoY Change	33.87%	2.46%	2.46%

Cashflow Statement

Concept	2021	2020 Q4	2020
OPERATING ACTIVITIES
Net Income	$419.2M	$83.62M	$137.7M
YoY Change	204.49%	5.98%	-54.95%
Depreciation, Depletion And Amortization
YoY Change
Cash From Operating Activities	$382.5M	$75.31M	$336.6M
YoY Change	13.63%	-0.12%	10.71%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	-$5.627B	$17.45M	-$88.25M
YoY Change	6276.65%	-101.45%	-95.28%
Cash From Investing Activities	-$5.627B	$17.45M	-$88.25M
YoY Change	6276.65%	-101.45%	-95.28%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$638.0M		$278.3M
YoY Change	129.23%		-25.25%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$5.508B	-231.6M	-$110.8M
YoY Change	-5072.71%	-119.41%	-106.87%
NET CHANGE
Cash From Operating Activities	$382.5M	75.31M	$336.6M
Cash From Investing Activities	-$5.627B	17.45M	-$88.25M
Cash From Financing Activities	$5.508B	-231.6M	-$110.8M
Net Change In Cash	$263.2M	-138.8M	$137.6M
YoY Change	91.33%	-310.64%	202.78%
FREE CASH FLOW
Cash From Operating Activities	$382.5M	$75.31M	$336.6M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	94-6181186
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	345 Park Avenue
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Entity Address Address Line2 EntityAddressAddressLine2	24th Floor
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	1-14788
CY2021	dei	Entity Registrant Name EntityRegistrantName	Blackstone Mortgage Trust, Inc.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2020	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccountingStandardsUpdate201613Member
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10154
CY2021	dei	City Area Code CityAreaCode	212
CY2021	dei	Trading Symbol TradingSymbol	BXMT
CY2021	dei	Local Phone Number LocalPhoneNumber	655-0220
CY2021	dei	Security12b Title Security12bTitle	Class A common stock,
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021Q4	us-gaap	Assets Assets	22703289000	USD
CY2020Q4	us-gaap	Assets Assets	16958955000	USD
CY2021Q4	us-gaap	Secured Debt Repurchase Agreements SecuredDebtRepurchaseAgreements	12280042000	USD
CY2020Q4	us-gaap	Senior Notes SeniorNotes	0	USD
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CY2020Q4	us-gaap	Secured Debt Repurchase Agreements SecuredDebtRepurchaseAgreements	7880536000	USD
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CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
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CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2021	dei	Entity Shell Company EntityShellCompany	false
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CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	384741000	USD
CY2021	bxmt	Cash Contributions From Joint Venture Partners That Increase Equity CashContributionsFromJointVenturePartnersThatIncreaseEquity	55912000	USD
CY2021	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	46632000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4618711000	USD
CY2021	us-gaap	Issuance Of Stock And Warrants For Services Or Claims IssuanceOfStockAndWarrantsForServicesOrClaims	0	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	34023000	USD
CY2020	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	736000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	422273000	USD
CY2020	bxmt	Adjustments To Additional Paid In Capital Deferred Compensation AdjustmentsToAdditionalPaidInCapitalDeferredCompensation	500000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	140414000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	140414000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	307393000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	27403000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.48
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	356892000	USD
CY2021	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	879000	USD
CY2020	bxmt	Cash Contributions From Joint Venture Partners That Increase Equity CashContributionsFromJointVenturePartnersThatIncreaseEquity	8431000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	15024000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3904231000	USD
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	638016000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	31040000	USD
CY2020	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	56844000	USD
CY2019	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	57926000	USD
CY2021	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	41002000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	31647000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	34532000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	30656000	USD
CY2021	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	68905000	USD
CY2020	us-gaap	Issuance Of Stock And Warrants For Services Or Claims IssuanceOfStockAndWarrantsForServicesOrClaims	19277000	USD
CY2019	us-gaap	Issuance Of Stock And Warrants For Services Or Claims IssuanceOfStockAndWarrantsForServicesOrClaims	0	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	37403000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	32195000	USD
CY2021	bxmt	Increase Decrease In Current Expected Credit Loss Reserve IncreaseDecreaseInCurrentExpectedCreditLossReserve	-39864000	USD
CY2020	bxmt	Increase Decrease In Current Expected Credit Loss Reserve IncreaseDecreaseInCurrentExpectedCreditLossReserve	167653000	USD
CY2019	bxmt	Increase Decrease In Current Expected Credit Loss Reserve IncreaseDecreaseInCurrentExpectedCreditLossReserve	0	USD
CY2021	bxmt	Repayments Of Secured Term Loans RepaymentsOfSecuredTermLoans	13495000	USD
CY2021	us-gaap	Difference Between Reported Amount And Reporting Currency Denominated Amount Value DifferenceBetweenReportedAmountAndReportingCurrencyDenominatedAmountValue	-6866000	USD
CY2020	us-gaap	Difference Between Reported Amount And Reporting Currency Denominated Amount Value DifferenceBetweenReportedAmountAndReportingCurrencyDenominatedAmountValue	-3366000	USD
CY2019	us-gaap	Difference Between Reported Amount And Reporting Currency Denominated Amount Value DifferenceBetweenReportedAmountAndReportingCurrencyDenominatedAmountValue	881000	USD
CY2021	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	3934000	USD
CY2020	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	867000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	1071000	USD
CY2021	bxmt	Realized Gains Losses On Derivative Financial Instruments Net RealizedGainsLossesOnDerivativeFinancialInstrumentsNet	-3890000	USD
CY2020	bxmt	Realized Gains Losses On Derivative Financial Instruments Net RealizedGainsLossesOnDerivativeFinancialInstrumentsNet	-1364000	USD
CY2019	bxmt	Realized Gains Losses On Derivative Financial Instruments Net RealizedGainsLossesOnDerivativeFinancialInstrumentsNet	-11000	USD
CY2020	bxmt	Repayments Of Secured Term Loans RepaymentsOfSecuredTermLoans	9113000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	24856000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-6311000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	21616000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-3352000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	7355000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-747000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	382483000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	336607000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	304037000	USD
CY2021	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	12550463000	USD
CY2020	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	1896276000	USD
CY2019	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	6890249000	USD
CY2021	us-gaap	Proceeds From Sale And Collection Of Loans Receivable ProceedsFromSaleAndCollectionOfLoansReceivable	6730339000	USD
CY2020	us-gaap	Proceeds From Sale And Collection Of Loans Receivable ProceedsFromSaleAndCollectionOfLoansReceivable	1850003000	USD
CY2019	us-gaap	Proceeds From Sale And Collection Of Loans Receivable ProceedsFromSaleAndCollectionOfLoansReceivable	4940194000	USD
CY2021	us-gaap	Proceeds From Loan Originations1 ProceedsFromLoanOriginations1	143002000	USD
CY2020	us-gaap	Proceeds From Loan Originations1 ProceedsFromLoanOriginations1	21275000	USD
CY2019	us-gaap	Proceeds From Loan Originations1 ProceedsFromLoanOriginations1	66558000	USD
CY2021	bxmt	Proceeds From Derivative Instruments In Investing Activities ProceedsFromDerivativeInstrumentsInInvestingActivities	76383000	USD
CY2020	bxmt	Proceeds From Derivative Instruments In Investing Activities ProceedsFromDerivativeInstrumentsInInvestingActivities	90427000	USD
CY2019	bxmt	Proceeds From Derivative Instruments In Investing Activities ProceedsFromDerivativeInstrumentsInInvestingActivities	49673000	USD
CY2021	bxmt	Payments For Derivative Instruments In Investing Activities PaymentsForDerivativeInstrumentsInInvestingActivities	77772000	USD
CY2020	bxmt	Payments For Derivative Instruments In Investing Activities PaymentsForDerivativeInstrumentsInInvestingActivities	133430000	USD
CY2019	bxmt	Payments For Derivative Instruments In Investing Activities PaymentsForDerivativeInstrumentsInInvestingActivities	6524000	USD
CY2021	bxmt	Payments For Collateral Deposits Related To Derivatives PaymentsForCollateralDepositsRelatedToDerivatives	109670000	USD
CY2020	bxmt	Payments For Collateral Deposits Related To Derivatives PaymentsForCollateralDepositsRelatedToDerivatives	346640000	USD
CY2019	bxmt	Payments For Collateral Deposits Related To Derivatives PaymentsForCollateralDepositsRelatedToDerivatives	59720000	USD
CY2021	bxmt	Proceeds From Collateral Deposits Related To Derivatives ProceedsFromCollateralDepositsRelatedToDerivatives	160720000	USD
CY2020	bxmt	Proceeds From Collateral Deposits Related To Derivatives ProceedsFromCollateralDepositsRelatedToDerivatives	326390000	USD
CY2019	bxmt	Proceeds From Collateral Deposits Related To Derivatives ProceedsFromCollateralDepositsRelatedToDerivatives	28920000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-5627461000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-88251000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1871148000	USD
CY2021	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	12475664000	USD
CY2020	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	2567834000	USD
CY2019	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	6322165000	USD
CY2021	bxmt	Repayment Of Loan Participants RepaymentOfLoanParticipants	0	USD
CY2020	bxmt	Repayment Of Loan Participants RepaymentOfLoanParticipants	0	USD
CY2019	bxmt	Repayment Of Loan Participants RepaymentOfLoanParticipants	115874000	USD
CY2021	bxmt	Proceeds From Issuance Of Secured Term Loan ProceedsFromIssuanceOfSecuredTermLoan	298500000	USD
CY2020	bxmt	Proceeds From Issuance Of Secured Term Loan ProceedsFromIssuanceOfSecuredTermLoan	315438000	USD
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	7801330000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	4690607000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	5526989000	USD
CY2021	bxmt	Proceeds From Issuance Of Collateralized Loan Obligations ProceedsFromIssuanceOfCollateralizedLoanObligations	803750000	USD
CY2020	bxmt	Proceeds From Issuance Of Collateralized Loan Obligations ProceedsFromIssuanceOfCollateralizedLoanObligations	2051875000	USD
CY2019	bxmt	Proceeds From Issuance Of Collateralized Loan Obligations ProceedsFromIssuanceOfCollateralizedLoanObligations	0	USD
CY2021	bxmt	Repayments For Collateralized Loan Obligations RepaymentsForCollateralizedLoanObligations	888763000	USD
CY2020	bxmt	Repayments For Collateralized Loan Obligations RepaymentsForCollateralizedLoanObligations	300879000	USD
CY2019	bxmt	Repayments For Collateralized Loan Obligations RepaymentsForCollateralizedLoanObligations	102478000	USD
CY2021	bxmt	Proceeds From Asset Specific Debt Agreements ProceedsFromAssetSpecificDebtAgreements	272065000	USD
CY2020	bxmt	Proceeds From Asset Specific Debt Agreements ProceedsFromAssetSpecificDebtAgreements	161960000	USD
CY2019	bxmt	Proceeds From Issuance Of Secured Term Loan ProceedsFromIssuanceOfSecuredTermLoan	748414000	USD
CY2019	bxmt	Proceeds From Asset Specific Debt Agreements ProceedsFromAssetSpecificDebtAgreements	247295000	USD
CY2021	bxmt	Repayments Of Asset Specific Debt Agreements RepaymentsOfAssetSpecificDebtAgreements	271065000	USD
CY2020	bxmt	Repayments Of Asset Specific Debt Agreements RepaymentsOfAssetSpecificDebtAgreements	82754000	USD
CY2019	bxmt	Repayments Of Asset Specific Debt Agreements RepaymentsOfAssetSpecificDebtAgreements	0	USD
CY2021	bxmt	Proceeds From Sale Of Loan Participation ProceedsFromSaleOfLoanParticipation	0	USD
CY2020	bxmt	Proceeds From Sale Of Loan Participation ProceedsFromSaleOfLoanParticipation	0	USD
CY2019	bxmt	Proceeds From Sale Of Loan Participation ProceedsFromSaleOfLoanParticipation	21346000	USD
CY2019	bxmt	Repayments Of Secured Term Loans RepaymentsOfSecuredTermLoans	3122000	USD
CY2021	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	400000000	USD
CY2021Q4	bxmt	Mortgage Loans On Real Estate Accounted For Under Cost Recovery Method MortgageLoansOnRealEstateAccountedForUnderCostRecoveryMethod	286300000	USD
CY2019Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	16277343000	USD
CY2020	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	43725000	USD
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	47345000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	39370000	USD
CY2021Q4	bxmt	Financing Receivable Number Of Loans FinancingReceivableNumberOfLoans	188	SecurityLoan
CY2021	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	55912000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	8431000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	51418000	USD
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	46632000	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	15024000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	41629000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	638005000	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	370662000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	278322000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	372337000	USD
CY2020Q4	bxmt	Financing Receivable Number Of Loans FinancingReceivableNumberOfLoans	120	SecurityLoan
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	348907000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	320961000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	5508224000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-110769000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1612552000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	263246000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	137587000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	45441000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	289970000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	150090000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	105662000	USD
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2062000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2293000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1013000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	551154000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	289970000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	425801000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	150090000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	287715000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	312093000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-73000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	232000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-109000	USD
CY2021	bxmt	Dividends Declared And Not Paid DividendsDeclaredAndNotPaid	104271000	USD
CY2021Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	22156437000	USD
CY2020Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	16652824000	USD
CY2020	bxmt	Dividends Declared And Not Paid DividendsDeclaredAndNotPaid	91004000	USD
CY2019	bxmt	Dividends Declared And Not Paid DividendsDeclaredAndNotPaid	83702000	USD
CY2021	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2020	us-gaap	Stock Issued1 StockIssued1	19277000	USD
CY2019	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2021	bxmt	Loan Principal Payments Held By Servicer LoanPrincipalPaymentsHeldByServicer	17528000	USD
CY2020	bxmt	Loan Principal Payments Held By Servicer LoanPrincipalPaymentsHeldByServicer	19460000	USD
CY2019	bxmt	Loan Principal Payments Held By Servicer LoanPrincipalPaymentsHeldByServicer	49584000	USD
CY2021	us-gaap	Nature Of Operations NatureOfOperations	<div style="margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:115%">1. ORGANIZATION </span></div><div style="margin-top:6pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">References herein to “Blackstone Mortgage Trust,” “Company,” “we,” “us” or “our” refer to Blackstone Mortgage Trust, Inc. and its subsidiaries unless the context specifically requires otherwise. </span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Blackstone Mortgage Trust is a real estate finance company that originates senior loans collateralized by commercial real estate in North America, Europe, and Australia. Our portfolio is composed primarily of loans secured by high-quality, institutional assets in major markets, sponsored by experienced, well-capitalized real estate investment owners and operators. These senior loans are capitalized by accessing a variety of financing options, including borrowing under our credit facilities, issuing CLOs or single-asset securitizations, and syndicating senior loan participations, depending on our view of the most prudent financing option available for each of our investments. We are not in the business of buying or trading securities, and the only securities we own are the retained interests from our securitization financing transactions, which we have not financed. We are externally managed by BXMT Advisors L.L.C., or our Manager, a subsidiary of Blackstone Inc., or Blackstone, and are a real estate investment trust, or REIT, traded on the New York Stock Exchange, or NYSE, under the symbol “BXMT.” Our principal executive offices are located at 345 Park Avenue, 24th Floor, New York, New York 10154. We were incorporated in Maryland in 1998, when we reorganized from a California common law business trust into a Maryland corporation. </span></div>We conduct our operations as a REIT for U.S. federal income tax purposes. We generally will not be subject to U.S. federal income taxes on our taxable income to the extent that we annually distribute all of our net taxable income to stockholders and maintain our qualification as a REIT. We also operate our business in a manner that permits us to maintain an exclusion from registration under the Investment Company Act of 1940, as amended. We are organized as a holding company and conduct our business primarily through our various subsidiaries.
CY2017Q2	bxmt	Joint Venture Capital Contribution Percentage JointVentureCapitalContributionPercentage	0.85
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:18pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:115%">Use of Estimates </span></div><div style="margin-top:6pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">The preparation of consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. As the novel coronavirus, or COVID-19, pandemic has evolved from its emergence in early 2020, so has its global impact. During the year ended December 31, 2021, many countries have re-instituted, or strongly encouraged, varying levels of quarantines and restrictions on travel and in some cases have at times limited operations of certain businesses and taken other restrictive measures designed to help slow the spread of COVID-19 and its variants. Governments and businesses have also instituted vaccine mandates and testing requirements for employees. While vaccine availability and uptake has increased, the longer-term macro-economic effects on global supply chains, inflation, labor shortages and wage increases continue to impact many industries, including the collateral underlying certain of our loans. Moreover, with the potential for new strains of COVID-19 to emerge, governments and businesses may re-impose aggressive measures to help slow its spread in the future. For this reason, among others, as the COVID-19 pandemic continues, the potential global impacts are uncertain and difficult to assess. We believe the estimates and assumptions underlying our consolidated financial statements are reasonable and supportable based on the information available as of December 31, 2021, however uncertainty over the ultimate impact COVID-19 will have on the global economy generally, and our business in particular, makes any estimates and assumptions as of December 31, 2021 inherently less certain than they would be absent the current and potential impacts of COVID-19. Actual results may ultimately differ materially from those estimates.</span></div>
CY2021	us-gaap	Revenue Recognition Interest RevenueRecognitionInterest	Revenue Recognition Interest income from our loans receivable portfolio and debt securities is recognized over the life of each investment using the effective interest method and is recorded on the accrual basis. Recognition of fees, premiums, and discounts associated with these investments is deferred and recorded over the term of the loan or debt security as an adjustment to yield. Income accrual is generally suspended for loans at the earlier of the date at which payments become 90 days past due or when, in the opinion of our Manager, recovery of income and principal becomes doubtful. Interest received is then recorded as a reduction in the outstanding principal balance until accrual is resumed when the loan becomes contractually current and performance is demonstrated to be resumed. In addition, for loans we originate, the related origination expenses are deferred and recognized as a component of interest income, however expenses related to loans we acquire are included in general and administrative expenses as incurred.
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	21878338000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	16399166000	USD
CY2021	bxmt	Mortgage Loan On Real Estate Final Maturity Term MortgageLoanOnRealEstateFinalMaturityTerm	P3Y4M24D
CY2020	bxmt	Mortgage Loan On Real Estate Final Maturity Term MortgageLoanOnRealEstateFinalMaturityTerm	P3Y1M6D
CY2021Q4	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2021Q4	us-gaap	Escrow Deposit EscrowDeposit	531200000	USD
CY2020Q4	us-gaap	Escrow Deposit EscrowDeposit	384600000	USD
CY2021Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	22156437000	USD
CY2019Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	-112542000	USD
CY2019Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	16164801000	USD
CY2020	bxmt	Financing Receivable New Issue FinancingReceivableNewIssue	1896276000	USD
CY2020	bxmt	Financing Receivable New Issue FinancingReceivableNewIssue	1896276000	USD
CY2020	bxmt	Financing Receivable Sale And Collection Of Finance Receivables FinancingReceivableSaleAndCollectionOfFinanceReceivables	1862955000	USD
CY2020	bxmt	Financing Receivable Sale And Collection Of Finance Receivables FinancingReceivableSaleAndCollectionOfFinanceReceivables	1862955000	USD
CY2020	bxmt	Financing Receivable Gain Loss On Foreign Currency Translation FinancingReceivableGainLossOnForeignCurrencyTranslation	342160000	USD
CY2020	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount Gain Loss On Foreign Currency Translation FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountGainLossOnForeignCurrencyTranslation	1900000	USD
CY2020	bxmt	Financing Receivable Before Allowance For Credit Loss Fee And Loan In Process Gain Loss On Foreign Currency Translation FinancingReceivableBeforeAllowanceForCreditLossFeeAndLoanInProcessGainLossOnForeignCurrencyTranslation	340260000	USD
CY2020	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount New Issues FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountNewIssues	21946000	USD
CY2020	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount New Issues FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountNewIssues	21946000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	14427000	USD
CY2020	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount Amortization FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountAmortization	56279000	USD
CY2020	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount Amortization FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountAmortization	56279000	USD
CY2020Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	16652824000	USD
CY2020Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	-80109000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	16572715000	USD
CY2021	bxmt	Financing Receivable New Issue FinancingReceivableNewIssue	12550463000	USD
CY2021	bxmt	Financing Receivable New Issue FinancingReceivableNewIssue	12550463000	USD
CY2021	bxmt	Financing Receivable Sale And Collection Of Finance Receivables FinancingReceivableSaleAndCollectionOfFinanceReceivables	6733105000	USD
CY2021	bxmt	Financing Receivable Sale And Collection Of Finance Receivables FinancingReceivableSaleAndCollectionOfFinanceReceivables	6733105000	USD
CY2021	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Write Off SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateWriteOff	14427000	USD
CY2021	bxmt	Financing Receivable Gain Loss On Foreign Currency Translation FinancingReceivableGainLossOnForeignCurrencyTranslation	-299318000	USD
CY2021	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount Gain Loss On Foreign Currency Translation FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountGainLossOnForeignCurrencyTranslation	-1424000	USD
CY2021	bxmt	Financing Receivable Before Allowance For Credit Loss Fee And Loan In Process Gain Loss On Foreign Currency Translation FinancingReceivableBeforeAllowanceForCreditLossFeeAndLoanInProcessGainLossOnForeignCurrencyTranslation	-297894000	USD
CY2021	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount New Issues FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountNewIssues	143002000	USD
CY2021	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount New Issues FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountNewIssues	143002000	USD
CY2021	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount Amortization FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountAmortization	68267000	USD
CY2021	bxmt	Financing Receivable Unamortized Loan Fee Cost And Purchase Premium Discount Amortization FinancingReceivableUnamortizedLoanFeeCostAndPurchasePremiumDiscountAmortization	68267000	USD
CY2021Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	22156437000	USD
CY2021Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	-153420000	USD
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	22003017000	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	124679000	USD
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	21878338000	USD
CY2021Q4	bxmt	Financing Receivable Number Of Loans FinancingReceivableNumberOfLoans	188	SecurityLoan
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	22003017000	USD
CY2021Q4	bxmt	Financing Receivable Loans Exposure Amount FinancingReceivableLoansExposureAmount	23669111000	USD
CY2021Q4	bxmt	Financing Receivable Percentage Of Loan Portfolio FinancingReceivablePercentageOfLoanPortfolio	1
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	124679000	USD
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	21878338000	USD
CY2021Q4	bxmt	Financing Receivable Number Of Loans FinancingReceivableNumberOfLoans	188	SecurityLoan
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	22003017000	USD
CY2021Q4	bxmt	Financing Receivable Loans Exposure Amount FinancingReceivableLoansExposureAmount	23669111000	USD
CY2021Q4	bxmt	Financing Receivable Percentage Of Loan Portfolio FinancingReceivablePercentageOfLoanPortfolio	1
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	124679000	USD
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	21878338000	USD
CY2021Q4	bxmt	Loan Exposure Amount Including Non Consolidated Senior Interests LoanExposureAmountIncludingNonConsolidatedSeniorInterests	1500000000	USD
CY2020Q4	bxmt	Financing Receivable Number Of Loans FinancingReceivableNumberOfLoans	120	SecurityLoan
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	16572715000	USD
CY2020Q4	bxmt	Financing Receivable Loans Exposure Amount FinancingReceivableLoansExposureAmount	17454621000	USD
CY2020Q4	bxmt	Financing Receivable Percentage Of Loan Portfolio FinancingReceivablePercentageOfLoanPortfolio	1
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	173549000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	16399166000	USD
CY2020Q4	bxmt	Financing Receivable Number Of Loans FinancingReceivableNumberOfLoans	120	SecurityLoan
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	16572715000	USD
CY2020Q4	bxmt	Financing Receivable Loans Exposure Amount FinancingReceivableLoansExposureAmount	17454621000	USD
CY2020Q4	bxmt	Financing Receivable Percentage Of Loan Portfolio FinancingReceivablePercentageOfLoanPortfolio	1
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	173549000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	16399166000	USD
CY2020Q4	bxmt	Loan Exposure Amount Including Non Consolidated Senior Interests LoanExposureAmountIncludingNonConsolidatedSeniorInterests	801800000	USD
CY2021Q4	bxmt	Financing Receivable Number Of Loans FinancingReceivableNumberOfLoans	188	SecurityLoan
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	22003017000	USD
CY2021Q4	bxmt	Financing Receivable Loans Exposure Amount FinancingReceivableLoansExposureAmount	23669111000	USD
CY2020Q4	bxmt	Financing Receivable Number Of Loans FinancingReceivableNumberOfLoans	120	SecurityLoan
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	16572715000	USD
CY2020Q4	bxmt	Financing Receivable Loans Exposure Amount FinancingReceivableLoansExposureAmount	17454621000	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	124679000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	173549000	USD
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	21878338000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	16399166000	USD
CY2021Q4	bxmt	Loan Exposure Amount Including Non Consolidated Senior Interests LoanExposureAmountIncludingNonConsolidatedSeniorInterests	1500000000	USD
CY2020Q4	bxmt	Loan Exposure Amount Including Non Consolidated Senior Interests LoanExposureAmountIncludingNonConsolidatedSeniorInterests	801800000	USD
CY2021Q4	bxmt	Weighted Average Risk Rating On Loan Exposure WeightedAverageRiskRatingOnLoanExposure	2.8
CY2020Q4	bxmt	Weighted Average Risk Rating On Loan Exposure WeightedAverageRiskRatingOnLoanExposure	3.0
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	124679000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2020	bxmt	Financing Receivable Credit Loss Period Increase Increase Decrease Excluding Writeoff FinancingReceivableCreditLossPeriodIncreaseIncreaseDecreaseExcludingWriteoff	159607000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	173549000	USD
CY2021	bxmt	Financing Receivable Credit Loss Period Increase Increase Decrease Excluding Writeoff FinancingReceivableCreditLossPeriodIncreaseIncreaseDecreaseExcludingWriteoff	-34443000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	173549000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	-48900000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	124700000	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	124679000	USD
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	21878338000	USD
CY2021Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	78000000.0	USD
CY2021Q4	us-gaap	Prepaid Taxes PrepaidTaxes	0	USD
CY2020Q4	us-gaap	Prepaid Taxes PrepaidTaxes	376000	USD
CY2021Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	572000	USD
CY2020Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	1195000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	16572715000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	173549000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	16399166000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	75700000	USD
CY2021Q4	us-gaap	Other Assets OtherAssets	273797000	USD
CY2021Q4	us-gaap	Interest Receivable InterestReceivable	86101000	USD
CY2020Q4	us-gaap	Interest Receivable InterestReceivable	66757000	USD
CY2021Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	78083000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	77445000	USD
CY2021Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	70000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	1723000	USD
CY2021Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	78013000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	75722000	USD
CY2021Q4	bxmt	Loan Portfolio Payments Held By Our Third Party Loan Servicer LoanPortfolioPaymentsHeldByOurThirdPartyLoanServicer	77624000	USD
CY2020Q4	bxmt	Loan Portfolio Payments Held By Our Third Party Loan Servicer LoanPortfolioPaymentsHeldByOurThirdPartyLoanServicer	73224000	USD
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	30531000	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	522000	USD
CY2021Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	956000	USD
CY2020Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	973000	USD
CY2021Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2020Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	51050000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	269819000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	1723000	USD
CY2021	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Period Increase Decrease DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease	-1653000	USD
CY2021Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	70000	USD
CY2019Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2020	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Period Increase Decrease DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease	1278000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	1723000	USD
CY2021	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Period Increase Decrease DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease	-1700000	USD
CY2021Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	70000	USD
CY2020	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Period Increase Decrease DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease	1300000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	1700000	USD
CY2021Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	104271000	USD
CY2020Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	91004000	USD
CY2021Q4	bxmt	Secured Debt Repayments Pending Servicer Remittance SecuredDebtRepaymentsPendingServicerRemittance	47664000	USD
CY2020Q4	bxmt	Secured Debt Repayments Pending Servicer Remittance SecuredDebtRepaymentsPendingServicerRemittance	0	USD
CY2021Q4	bxmt	Debt Instrument Covenant Requirement On Consolidated Tangible Net Worth Minimum DebtInstrumentCovenantRequirementOnConsolidatedTangibleNetWorthMinimum	3500000000	USD
CY2021Q4	bxmt	Debt Instrument Covenant Maximum Percentage Of Cash Liquidity On Recourse Indebtedness DebtInstrumentCovenantMaximumPercentageOfCashLiquidityOnRecourseIndebtedness	0.05
CY2021Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	29851000	USD
CY2020Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	20548000	USD
CY2021Q4	us-gaap	Due To Related Parties Current And Noncurrent DueToRelatedPartiesCurrentAndNoncurrent	28373000	USD
CY2020Q4	us-gaap	Due To Related Parties Current And Noncurrent DueToRelatedPartiesCurrentAndNoncurrent	19158000	USD
CY2021Q4	bxmt	Credit Spread Adjustment CreditSpreadAdjustment	0.0011
CY2021	bxmt	Interest Expense Secured Debt InterestExpenseSecuredDebt	46000000	USD
CY2020	bxmt	Interest Expense Secured Debt InterestExpenseSecuredDebt	43100000	USD
CY2021Q4	us-gaap	Accounts Payable And Other Accrued Liabilities AccountsPayableAndOtherAccruedLiabilities	9046000	USD
CY2020Q4	us-gaap	Accounts Payable And Other Accrued Liabilities AccountsPayableAndOtherAccruedLiabilities	2671000	USD
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	5890000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	58915000	USD
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	6263000	USD
CY2020Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	10031000	USD
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	231358000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	202327000	USD
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2020Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	51100000	USD
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2021Q4	bxmt	Stock Shares Authorized StockSharesAuthorized	500000000	shares
CY2020Q1	us-gaap	Share Price SharePrice	22.93
CY2020Q1	us-gaap	Stock Issued During Period Shares Issued For Services StockIssuedDuringPeriodSharesIssuedForServices	840696	shares
CY2021Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0375
CY2021Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0375
CY2021Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	6300000	USD
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CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	10000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	-7000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Before Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax	-195000	USD
CY2021	us-gaap	Interest Expense InterestExpense	340200000	USD
CY2020	us-gaap	Interest Expense InterestExpense	347500000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	81598000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-59703000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-5736000	USD
CY2019	us-gaap	Interest Expense InterestExpense	458500000	USD
CY2021	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	20363592	shares
CY2021Q4	bxmt	Common Stock Shares Outstanding Including Stock Equivalents CommonStockSharesOutstandingIncludingStockEquivalents	168543370	shares
CY2020Q4	bxmt	Common Stock Shares Outstanding Including Stock Equivalents CommonStockSharesOutstandingIncludingStockEquivalents	147086722	shares
CY2020Q1	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	19300000	USD
CY2020	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	10842746	shares
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	10535842	shares
CY2021	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	1036175	shares
CY2020Q4	bxmt	Common Stock Shares Outstanding Including Stock Equivalents CommonStockSharesOutstandingIncludingStockEquivalents	147086722	shares
CY2019Q4	bxmt	Common Stock Shares Outstanding Including Stock Equivalents CommonStockSharesOutstandingIncludingStockEquivalents	135263728	shares
CY2018Q4	bxmt	Common Stock Shares Outstanding Including Stock Equivalents CommonStockSharesOutstandingIncludingStockEquivalents	123664577	shares
CY2020	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	933623	shares
CY2019	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	1032082	shares
CY2021	us-gaap	Deferred Compensation Arrangement With Individual Shares Issued DeferredCompensationArrangementWithIndividualSharesIssued	56881	shares
CY2020	us-gaap	Deferred Compensation Arrangement With Individual Shares Issued DeferredCompensationArrangementWithIndividualSharesIssued	46625	shares
CY2019	us-gaap	Deferred Compensation Arrangement With Individual Shares Issued DeferredCompensationArrangementWithIndividualSharesIssued	31227	shares
CY2019Q4	bxmt	Common Stock Shares Outstanding Including Stock Equivalents CommonStockSharesOutstandingIncludingStockEquivalents	135263728	shares
CY2021	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	2184	shares
CY2020	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	2050	shares
CY2019	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	1214	shares
CY2021	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	2184	shares
CY2020	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	2050	shares
CY2019	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	1214	shares
CY2021Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.62
CY2021Q4	us-gaap	Dividends Dividends	104300000	USD
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	151521941	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	151521941	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.35
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141795977	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	141795977	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	130085398	shares
CY2020Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	4800000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	8300000	USD
CY2021Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	86400000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.48
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.48
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.48
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	130085398	shares
CY2021	bxmt	Class A Common Stock Dividends Declared ClassACommonStockDividendsDeclared	1.0000
CY2020	bxmt	Class A Common Stock Dividends Declared ClassACommonStockDividendsDeclared	1.0000
CY2020	bxmt	Direct Stock Units Dividends Declared DirectStockUnitsDividendsDeclared	0
CY2019	bxmt	Class A Common Stock Dividends Declared ClassACommonStockDividendsDeclared	1.0000
CY2021	bxmt	Direct Stock Units Dividends Declared DirectStockUnitsDividendsDeclared	0
CY2019	bxmt	Direct Stock Units Dividends Declared DirectStockUnitsDividendsDeclared	0
CY2021	bxmt	Common Stock Dividends Declared CommonStockDividendsDeclared	1.0000
CY2020	bxmt	Common Stock Dividends Declared CommonStockDividendsDeclared	1.0000
CY2019	bxmt	Common Stock Dividends Declared CommonStockDividendsDeclared	1.0000
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.77
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.77
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-78100000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	11200000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.97
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.35
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-6400000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	419193000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	137670000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	305567000	USD
CY2020	us-gaap	Restricted Stock Expense RestrictedStockExpense	34032000	USD
CY2020	bxmt	General And Administrative Operating And Other Costs GeneralAndAdministrativeOperatingAndOtherCosts	4015000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	500000	USD
CY2020	bxmt	Non Cash And Legacy Compensation Expenses NonCashAndLegacyCompensationExpenses	34532000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	500000	USD
CY2021	bxmt	Non Cash And Legacy Compensation Expenses NonCashAndLegacyCompensationExpenses	31647000	USD
CY2019	us-gaap	Restricted Stock Expense RestrictedStockExpense	30156000	USD
CY2019	bxmt	General And Administrative Operating And Other Costs GeneralAndAdministrativeOperatingAndOtherCosts	3035000	USD
CY2021	bxmt	Core General And Administrative Expenses CoreGeneralAndAdministrativeExpenses	11521000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	595000	USD
CY2021	us-gaap	Professional Fees ProfessionalFees	7759000	USD
CY2020	us-gaap	Professional Fees ProfessionalFees	7324000	USD
CY2019	us-gaap	Professional Fees ProfessionalFees	5163000	USD
CY2021	bxmt	General And Administrative Operating And Other Costs GeneralAndAdministrativeOperatingAndOtherCosts	3762000	USD
CY2020	bxmt	Core General And Administrative Expenses CoreGeneralAndAdministrativeExpenses	11339000	USD
CY2019	bxmt	Core General And Administrative Expenses CoreGeneralAndAdministrativeExpenses	8198000	USD
CY2021	us-gaap	Restricted Stock Expense RestrictedStockExpense	31052000	USD
CY2020Q4	bxmt	Asset Specific Debt Gross AssetSpecificDebtGross	399699000	USD
CY2019	bxmt	Non Cash And Legacy Compensation Expenses NonCashAndLegacyCompensationExpenses	30656000	USD
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	43168000	USD
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	45871000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	38854000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	423000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	323000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-506000	USD
CY2013Q2	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	25875000	shares
CY2021Q4	bxmt	Operating Loss Carryforwards Limitations On Use Annual Limitation OperatingLossCarryforwardsLimitationsOnUseAnnualLimitation	2000000.0	USD
CY2021Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	159000000.0	USD
CY2021Q4	bxmt	Number Of Benefit Plans NumberOfBenefitPlans	9	plan
CY2021Q4	bxmt	Number Of Expired Benefit Plans NumberOfExpiredBenefitPlans	7	loan
CY2020Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	16652824000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	79200000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	79200000	USD
CY2021Q4	bxmt	Number Of Current Benefit Plans NumberOfCurrentBenefitPlans	2	loan
CY2021Q4	bxmt	Securitized Debt Obligations Net Face Amount SecuritizedDebtObligationsNetFaceAmount	2855625000	USD
CY2020Q4	bxmt	Securitized Debt Obligations Net Face Amount SecuritizedDebtObligationsNetFaceAmount	2940638000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	551154000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	289970000	USD
CY2021Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	22156437000	USD
CY2021Q4	bxmt	Asset Specific Debt Gross AssetSpecificDebtGross	400699000	USD
CY2021Q4	srt	Mortgage Loans On Real Estate Federal Income Tax Basis1 MortgageLoansOnRealEstateFederalIncomeTaxBasis1	21300000000	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	124700000	USD
CY2020	us-gaap	Mortgage Loans On Real Estate Amortization Of Premium MortgageLoansOnRealEstateAmortizationOfPremium	56279000	USD
CY2019	us-gaap	Mortgage Loans On Real Estate Amortization Of Premium MortgageLoansOnRealEstateAmortizationOfPremium	57415000	USD
CY2021	us-gaap	Mortgage Loans On Real Estate Amortization Of Premium MortgageLoansOnRealEstateAmortizationOfPremium	68267000	USD
CY2021	srt	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	6733105000	USD
CY2020	srt	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	1862955000	USD
CY2021Q4	bxmt	Loans Outstanding With Unfunded Commitments LoansOutstandingWithUnfundedCommitments	118	loan
CY2019	srt	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	4974881000	USD
CY2020Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	16572715000	USD
CY2019Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	16164801000	USD
CY2018Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	14191200000	USD
CY2021	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Write Off SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateWriteOff	14427000	USD
CY2021	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	12550463000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	480802000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1831824000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	3873162000	USD
CY2020	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	1896276000	USD
CY2019	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	6890249000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1562382000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	6054180000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1269700000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	15072050000	USD
CY2021	bxmt	Debt Instrument Amortization Percentage DebtInstrumentAmortizationPercentage	0.010
CY2021Q4	bxmt	Securitized Debt Obligations Excluded From Contractual Obligations SecuritizedDebtObligationsExcludedFromContractualObligations	2900000000	USD
CY2021Q4	bxmt	Nonconsolidated Securitized Debt Excluded From Contractual Obligations NonconsolidatedSecuritizedDebtExcludedFromContractualObligations	1500000000	USD
CY2021Q4	bxmt	Nonconsolidated Senior Interests Excluded From Contractual Obligations NonconsolidatedSeniorInterestsExcludedFromContractualObligations	300100000	USD
CY2021	bxmt	Number Of Directors Eligible For Annual Compensation NumberOfDirectorsEligibleForAnnualCompensation	6	director
CY2021Q4	srt	Mortgage Loans On Real Estate Prior Liens1 MortgageLoansOnRealEstatePriorLiens1	1512675000	USD
CY2021Q4	srt	Mortgage Loans On Real Estate Face Amount Of Mortgages MortgageLoansOnRealEstateFaceAmountOfMortgages	22156437000	USD
CY2020	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Write Off SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateWriteOff	0	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	22003017000	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	124679000	USD
CY2021Q4	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Net SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateNet	21878338000	USD
CY2019	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Write Off SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateWriteOff	0	USD
CY2019Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	0	USD
CY2021Q4	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Net SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateNet	21878338000	USD
CY2020Q4	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Net SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateNet	16399166000	USD
CY2021	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Foreign Currency Translation SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateForeignCurrencyTranslation	-297894000	USD
CY2020	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Foreign Currency Translation SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateForeignCurrencyTranslation	340260000	USD
CY2019	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Foreign Currency Translation SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateForeignCurrencyTranslation	67376000	USD
CY2021	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Deferred Fees And Other SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateDeferredFeesAndOther	143002000	USD
CY2020	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Deferred Fees And Other SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateDeferredFeesAndOther	21946000	USD
CY2019	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Deferred Fees And Other SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateDeferredFeesAndOther	66558000	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	22003017000	USD
CY2020Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	16572715000	USD
CY2019Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	16164801000	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	124679000	USD
CY2020Q4	us-gaap	Mortgage Loans On Real Estate Writedown Or Reserve Amount1 MortgageLoansOnRealEstateWritedownOrReserveAmount1	173549000	USD
CY2019Q4	bxmt	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Net SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateNet	16164801000	USD

Files In Submission

Name	View Source	Status
0001061630-22-000016-index-headers.html	Edgar Link	pending
0001061630-22-000016-index.html	Edgar Link	pending
0001061630-22-000016.txt	Edgar Link	pending
0001061630-22-000016-xbrl.zip	Edgar Link	pending
bxmt-20211231.htm	Edgar Link	pending
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bxmt-20211231_def.xml	Edgar Link	unprocessable
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bxmt-20211231_lab.xml	Edgar Link	unprocessable
bxmt-20211231_pre.xml	Edgar Link	unprocessable
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$BXMT
BLACKSTONE MORTGAGE TRUST, INC. Stock $bxmt

2021 Form 10-K Financial Statement

#000106163022000016 Filed on February 09, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BXMT BLACKSTONE MORTGAGE TRUST, INC. Stock $bxmt

2021 Form 10-K Financial Statement

#000106163022000016 Filed on February 09, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BXMT
BLACKSTONE MORTGAGE TRUST, INC. Stock $bxmt