$GPMT
Granite Point Mortgage Trust Inc. Stock $gpmt

$gpmt Overview Financials Valuation SEC Filings Company Website

2019 Q3 Form 10-Q Financial Statement

#000170364419000099 Filed on November 05, 2019

Income Statement

Concept	2019 Q3	2018 Q3	2018 Q2
Revenue	$63.44M	$47.56M	$43.51M
YoY Change	33.4%	54.1%	66.7%
Cost Of Revenue	$40.16M	$26.48M	$24.35M
YoY Change	51.66%	69.42%	151.03%
Gross Profit	$23.28M	$21.08M	$19.72M
YoY Change	10.44%	38.32%	20.24%
Gross Profit Margin	36.69%	44.32%	45.32%
Selling, General & Admin	$5.890M	$4.520M	$4.500M
YoY Change	30.31%	21.51%	103.62%
% of Gross Profit	25.3%	21.44%	22.82%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$190.0K	$0.00	$0.00
YoY Change
% of Gross Profit	0.82%	0.0%	0.0%
Operating Expenses	$5.890M	$4.520M	$4.500M
YoY Change	30.31%	21.51%	103.62%
Operating Profit	$17.39M	$16.56M	$15.22M
YoY Change	5.01%	43.75%	7.26%
Interest Expense	$36.36M	$23.37M	$21.24M
YoY Change	55.63%	86.96%	173.19%
% of Operating Profit	209.1%	141.09%	139.52%
Other Income/Expense, Net	$0.00	$0.00	$564.0K
YoY Change
Pretax Income	$17.39M	$16.56M	$15.23M
YoY Change	4.99%	43.83%	7.26%
Income Tax	-$1.000K	-$1.000K	-$2.000K
% Of Pretax Income	-0.01%	-0.01%	-0.01%
Net Earnings	$17.39M	$16.57M	$15.23M
YoY Change	4.99%	44.13%	7.26%
Net Earnings / Revenue	27.41%	34.83%	35.0%
Basic Earnings Per Share	$0.32	$0.38	$0.35
Diluted Earnings Per Share	$0.32	$0.37	$0.34
COMMON SHARES
Basic Shares Outstanding	54.85M shares	43.46M shares	43.45M shares
Diluted Shares Outstanding	54.85M shares	50.65M shares	50.63M shares

Balance Sheet

Concept	2019 Q3	2018 Q3	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$137.4M	$148.2M	$92.30M
YoY Change	-7.29%	4.07%	-62.95%
Cash & Equivalents	$137.4M	$148.2M	$92.26M
Short-Term Investments
Other Short-Term Assets	$1.300M	$1.300M	$200.0K
YoY Change	0.0%
Inventory
Prepaid Expenses
Receivables	$10.80M	$8.200M	$7.600M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$149.5M	$157.7M	$100.1M
YoY Change	-5.2%	-1.99%	-62.21%
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$3.960B	$2.752B	$2.530B
YoY Change	43.89%	25.98%	40.91%
Other Assets	$176.0M	$10.70M	$23.40M
YoY Change	1544.86%	-8.55%	103.48%
Total Long-Term Assets	$4.158B	$2.777B	$2.568B
YoY Change	49.72%	26.48%	42.1%
TOTAL ASSETS
Total Short-Term Assets	$149.5M	$157.7M	$100.1M
Total Long-Term Assets	$4.158B	$2.777B	$2.568B
Total Assets	$4.308B	$2.935B	$2.668B
YoY Change	46.77%	24.53%	28.76%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$27.00M	$15.30M	$11.50M
YoY Change	76.47%	93.67%	167.44%
Deferred Revenue
YoY Change
Short-Term Debt	$284.4M	$679.6M	$523.0M
YoY Change	-58.15%	997.9%	-23.65%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$334.5M	$713.2M	$551.9M
YoY Change	-53.1%	752.09%	-20.14%
LONG-TERM LIABILITIES
Long-Term Debt	$2.949B	$1.395B	$1.288B
YoY Change	111.37%	-3.19%	135.31%
Other Long-Term Liabilities	$200.0K	$100.0K	$600.0K
YoY Change	100.0%	-80.0%	500.0%
Total Long-Term Liabilities	$2.949B	$1.395B	$1.289B
YoY Change	111.37%	-3.21%	135.38%
TOTAL LIABILITIES
Total Short-Term Liabilities	$334.5M	$713.2M	$551.9M
Total Long-Term Liabilities	$2.949B	$1.395B	$1.289B
Total Liabilities	$3.283B	$2.108B	$1.841B
YoY Change	55.74%	38.25%	48.6%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock	$549.0K	$435.0K	$435.0K
YoY Change	26.21%	0.69%	0.69%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.023B	$825.7M	$826.4M
YoY Change
Total Liabilities & Shareholders Equity	$4.308B	$2.935B	$2.668B
YoY Change	46.77%	24.53%	28.76%

Cashflow Statement

Concept	2019 Q3	2018 Q3	2018 Q2
OPERATING ACTIVITIES
Net Income	$17.39M	$16.57M	$15.23M
YoY Change	4.99%	44.13%	7.26%
Depreciation, Depletion And Amortization	$190.0K	$0.00	$0.00
YoY Change
Cash From Operating Activities	$25.01M	$16.61M	$13.89M
YoY Change	50.57%	-0.84%	-181.28%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	-$361.4M	-$218.2M	-$112.1M
YoY Change	65.62%	-43.59%	-51.77%
Cash From Investing Activities	-$361.4M	-$218.2M	-$112.1M
YoY Change	65.62%	-43.59%	-51.77%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	473.6M	246.4M	129.9M
YoY Change	92.21%	-6.43%	-72.02%
NET CHANGE
Cash From Operating Activities	25.01M	16.61M	13.89M
Cash From Investing Activities	-361.4M	-218.2M	-112.1M
Cash From Financing Activities	473.6M	246.4M	129.9M
Net Change In Cash	137.2M	44.79M	31.69M
YoY Change	206.3%	-141.95%	-85.23%
FREE CASH FLOW
Cash From Operating Activities	$25.01M	$16.61M	$13.89M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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CY2019Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	1000	shares
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	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	61-1843143
	dei	Entity Address Address Line1 EntityAddressAddressLine1	3 Bryant Park, Suite 2400A
	dei	Document Type DocumentType	10-Q
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	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
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	dei	Entity Address City Or Town EntityAddressCityOrTown	New York,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
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	dei	City Area Code CityAreaCode	212
	dei	Local Phone Number LocalPhoneNumber	364-3200
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	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	12141000	USD
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	9691000	USD
CY2018Q3	us-gaap	Costs And Expenses CostsAndExpenses	7631000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	29427000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	23143000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	17391000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	16564000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	52534000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	46376000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	17392000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	16565000	USD
	us-gaap	Net Income Loss NetIncomeLoss	46378000	USD
CY2019Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	25000	USD
CY2018Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	25000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	75000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	75000	USD
CY2019Q3	gpmt	Net Income Availableto Common Stockholders NetIncomeAvailabletoCommonStockholders	17367000	USD
CY2018Q3	gpmt	Net Income Availableto Common Stockholders NetIncomeAvailabletoCommonStockholders	16540000	USD
	gpmt	Net Income Availableto Common Stockholders NetIncomeAvailabletoCommonStockholders	52463000	USD
	gpmt	Net Income Availableto Common Stockholders NetIncomeAvailabletoCommonStockholders	46303000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.00
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.07
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.32
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.00
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.04
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.42
CY2018Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.42
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.26
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.20
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	54853205	shares
CY2018Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	0	USD
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43456234	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	52492324	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43426109	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54853205	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50651612	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	52492324	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50616264	shares
CY2019Q3	gpmt	Net Income Availableto Common Stockholders NetIncomeAvailabletoCommonStockholders	17367000	USD
CY2018Q3	gpmt	Net Income Availableto Common Stockholders NetIncomeAvailabletoCommonStockholders	16540000	USD
	gpmt	Net Income Availableto Common Stockholders NetIncomeAvailabletoCommonStockholders	52463000	USD
	gpmt	Net Income Availableto Common Stockholders NetIncomeAvailabletoCommonStockholders	46303000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	32000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	224000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	32000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	0	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	32000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	224000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	32000	USD
CY2019Q3	gpmt	Comprehensive Income Loss Attributableto Common Stockholders ComprehensiveIncomeLossAttributabletoCommonStockholders	17367000	USD
CY2018Q3	gpmt	Comprehensive Income Loss Attributableto Common Stockholders ComprehensiveIncomeLossAttributabletoCommonStockholders	16572000	USD
	gpmt	Comprehensive Income Loss Attributableto Common Stockholders ComprehensiveIncomeLossAttributabletoCommonStockholders	52687000	USD
	gpmt	Comprehensive Income Loss Attributableto Common Stockholders ComprehensiveIncomeLossAttributabletoCommonStockholders	46335000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	828621000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	14586000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	16000	USD
CY2018Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	0	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	16000	USD
CY2018Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	16506000	USD
CY2018Q1	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	25000	USD
CY2018Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	664000	USD
CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	827356000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	15227000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-16000	USD
CY2018Q2	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	0	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-16000	USD
CY2018Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	17383000	USD
CY2018Q2	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	25000	USD
CY2018Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1203000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	826362000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	16565000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	32000	USD
CY2018Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	18251000	USD
CY2018Q3	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	25000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	967000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	825650000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	17392000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	827531000	USD
CY2018Q4	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1 StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	827531000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	16969000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	192000	USD
CY2019Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	0	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	192000	USD
CY2019Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	157228000	USD
CY2019Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	21913000	USD
CY2019Q1	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	25000	USD
CY2019Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1149000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	981131000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	18177000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	32000	USD
CY2019Q2	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	0	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	32000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	50177000	USD
CY2019Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	23039000	USD
CY2019Q2	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	25000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1283000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	1027736000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	0	USD
CY2019Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	0	USD
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	23038000	USD
CY2019Q3	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	25000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1175000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	1023240000	USD
	us-gaap	Net Income Loss NetIncomeLoss	52538000	USD
	us-gaap	Net Income Loss NetIncomeLoss	46378000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	11038000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	9282000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5792000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2373000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3607000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	2834000	USD
	us-gaap	Depreciation Depreciation	185000	USD
	us-gaap	Depreciation Depreciation	4000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	529000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	1083000	USD
	gpmt	Increase Decreasein Unamortized Debt Issuance Expense IncreaseDecreaseinUnamortizedDebtIssuanceExpense	3259000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-383147000	USD
	gpmt	Increase Decreasein Unamortized Debt Issuance Expense IncreaseDecreaseinUnamortizedDebtIssuanceExpense	-3472000	USD
	gpmt	Proceedsfrom Assets Soldunder Agreementsto Repurchase ProceedsfromAssetsSoldunderAgreementstoRepurchase	1014802000	USD
	gpmt	Proceedsfrom Assets Soldunder Agreementsto Repurchase ProceedsfromAssetsSoldunderAgreementstoRepurchase	871608000	USD
	gpmt	Principal Paymentson Assets Soldunder Agreementsto Repurchase PrincipalPaymentsonAssetsSoldunderAgreementstoRepurchase	790433000	USD
	gpmt	Principal Paymentson Assets Soldunder Agreementsto Repurchase PrincipalPaymentsonAssetsSoldunderAgreementstoRepurchase	1111961000	USD
	us-gaap	Proceeds From Securitizations Of Loans Held For Investment ProceedsFromSecuritizationsOfLoansHeldForInvestment	646868000	USD
	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	258000	USD
	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	945000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	6825000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1963000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	4859000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	2501000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-295000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-80000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	5632000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2893000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	53668000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	43630000	USD
	us-gaap	Payments To Acquire Loans And Leases Held For Investment PaymentsToAcquireLoansAndLeasesHeldForInvestment	1216678000	USD
	us-gaap	Payments To Acquire Loans And Leases Held For Investment PaymentsToAcquireLoansAndLeasesHeldForInvestment	839668000	USD
	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	468534000	USD
	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	444878000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	7102000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	11643000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-741042000	USD
	us-gaap	Proceeds From Securitizations Of Loans Held For Investment ProceedsFromSecuritizationsOfLoansHeldForInvestment	651374000	USD
	us-gaap	Repayments Of Accounts Receivable Securitization RepaymentsOfAccountsReceivableSecuritization	181000000	USD
	us-gaap	Repayments Of Accounts Receivable Securitization RepaymentsOfAccountsReceivableSecuritization	0	USD
	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	0	USD
	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	18247000	USD
	us-gaap	Proceeds From Other Short Term Debt ProceedsFromOtherShortTermDebt	114080000	USD
	us-gaap	Proceeds From Other Short Term Debt ProceedsFromOtherShortTermDebt	0	USD
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	164598000	USD
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	49394000	USD
	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	239598000	USD
	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	49394000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	207405000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	75000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	75000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	63273000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Before Fees Gross LoansAndLeasesReceivableBeforeFeesGross	3193641000	USD
CY2018Q4	gpmt	Unamortized Discountsor Premiums Loans Heldfor Investment UnamortizedDiscountsorPremiumsLoansHeldforInvestment	-151000	USD
	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.10
CY2018Q4	gpmt	Unamortized Net Deferred Origination Fees Loans Heldfor Investment UnamortizedNetDeferredOriginationFeesLoansHeldforInvestment	-25577000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	50318000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	870115000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	382347000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	182741000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	42830000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	123423000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	110718000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	306164000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	153548000	USD
	us-gaap	Interest Paid Net InterestPaidNet	95848000	USD
	us-gaap	Interest Paid Net InterestPaidNet	60472000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-5000	USD
CY2019Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	23063000	USD
CY2018Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	18276000	USD
	us-gaap	Nature Of Operations NatureOfOperations	Organization and Operations<div style="line-height:120%;padding-top:4px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Granite Point Mortgage Trust Inc., or the Company, is a Maryland corporation that focuses primarily on directly originating, investing in and managing senior floating-rate commercial mortgage loans and other debt and debt-like commercial real estate investments. The Company is externally managed by Pine River Capital Management L.P., or the Manager. The Company’s common stock is listed on the New York Stock Exchange, or NYSE, under the symbol “GPMT”.</span></div><div style="line-height:120%;padding-top:4px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company was incorporated on April 7, 2017 and commenced operations as a publicly traded company on June 28, 2017, upon completion of an initial public offering, or the IPO. Concurrently with the closing of the IPO, the Company completed a formation transaction, or the Formation Transaction, pursuant to which the Company acquired the equity interests in TH Commercial Holdings LLC (now known as GP Commercial Holdings LLC), or the Predecessor, from Two Harbors Investment Corp., or Two Harbors, a publicly traded hybrid mortgage real estate investment trust (NYSE: TWO). In exchange, the Company issued </span><span style="font-family:inherit;font-size:10pt;"><span>33,071,000</span></span><span style="font-family:inherit;font-size:10pt;"> shares of its common stock, representing approximately </span><span style="font-family:inherit;font-size:10pt;"><span>76.5%</span></span><span style="font-family:inherit;font-size:10pt;"> of its outstanding common stock after the IPO, and </span><span style="font-family:inherit;font-size:10pt;"><span>1,000</span></span><span style="font-family:inherit;font-size:10pt;"> shares of its </span><span style="font-family:inherit;font-size:10pt;"><span>10%</span></span><span style="font-family:inherit;font-size:10pt;"> cumulative redeemable preferred stock to Two Harbors. Upon the completion of the Formation Transaction, the Predecessor became the Company’s wholly owned indirect subsidiary. On November 1, 2017, Two Harbors distributed to its common stockholders the </span><span style="font-family:inherit;font-size:10pt;"><span>33,071,000</span></span><span style="font-family:inherit;font-size:10pt;"> shares of the Company’s common stock it had acquired in connection with the Formation Transaction, allowing the Company’s market capitalization to be fully floating. </span></div><div style="line-height:120%;padding-top:4px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company has elected to be treated as a real estate investment trust, or REIT, as defined under the Internal Revenue Code of 1986, as amended, or the Code, for U.S. federal income tax purposes. As long as the Company continues to comply with a number of requirements under federal tax law and maintains its qualification as a REIT, the Company generally will not be subject to U.S. federal income taxes to the extent that the Company distributes its taxable income to its stockholders on an annual basis and does not engage in prohibited transactions. However, certain activities that the Company may perform may cause it to earn income which will not be qualifying income for REIT purposes. The Company has designated one of its subsidiaries as a taxable REIT subsidiary, or TRS, as defined in the Code, to engage in such activities.</span></div>
CY2017Q2	us-gaap	Minority Interest Ownership Percentage By Parent MinorityInterestOwnershipPercentageByParent	0.765
CY2017Q4	gpmt	Two Harbors Investment Corp Distributionof Special Dividend Shares TwoHarborsInvestmentCorpDistributionofSpecialDividendShares	33071000	shares
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3167913000	USD
CY2019Q3	us-gaap	Financing Receivable Threshold Period Past Due Writeoff FinancingReceivableThresholdPeriodPastDueWriteoff	P30D
	gpmt	Threshold Period Delinquentfor Placementof Financing Receivableon Nonaccrual Status ThresholdPeriodDelinquentforPlacementofFinancingReceivableonNonaccrualStatus	P90D
	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-top:4px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</span></div><div style="line-height:120%;padding-top:4px;text-align:left;text-indent:18px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with U.S. GAAP requires management to make a number of significant estimates. These include estimates of fair value of certain assets and liabilities, amount and timing of allowances for loan losses and impairments and other estimates that affect the reported amounts of certain assets and liabilities as of the date of the </span><span style="font-family:inherit;font-size:10pt;">condensed consolidated</span><span style="font-family:inherit;font-size:10pt;"> financial statements and the reported amounts of certain revenues and expenses during the reported period. It is likely that changes in these estimates (</span><span style="font-family:inherit;font-size:10pt;font-style:italic;">e.g.</span><span style="font-family:inherit;font-size:10pt;">, valuation changes to the underlying collateral of loans due to changes in capitalization rates, leasing, credit worthiness of major tenants, occupancy rates, availability of financing, exit plan, loan sponsorship, actions of other lenders, overall economic conditions, the broader commercial real estate market, local geographic sub-markets or other factors) will occur in the near term. The Company’s estimates are inherently subjective in nature and actual results could differ from its estimates and the differences may be material.</span></div>
CY2019Q3	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets VariableInterestEntityNonconsolidatedCarryingAmountAssets	32400000	USD
CY2018Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets VariableInterestEntityNonconsolidatedCarryingAmountAssets	39300000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Before Fees Gross LoansAndLeasesReceivableBeforeFeesGross	3955820000	USD
CY2019Q3	gpmt	Unamortized Discountsor Premiums Loans Heldfor Investment UnamortizedDiscountsorPremiumsLoansHeldforInvestment	-127000	USD
CY2019Q3	gpmt	Unamortized Net Deferred Origination Fees Loans Heldfor Investment UnamortizedNetDeferredOriginationFeesLoansHeldforInvestment	-28598000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3927095000	USD
CY2019Q3	gpmt	Unfunded Commitments Loans Heldfor Investment UnfundedCommitmentsLoansHeldforInvestment	666959000	USD
CY2019Q3	gpmt	Numberof Loans Heldfor Investment NumberofLoansHeldforInvestment	116	loan
CY2019Q3	gpmt	Weighted Average Coupon Rate Loans Heldfor Investment WeightedAverageCouponRateLoansHeldforInvestment	0.059
	gpmt	Weighted Average Yearsto Maturity Loans Heldfor Investment WeightedAverageYearstoMaturityLoansHeldforInvestment	P1Y9M18D
CY2018Q4	gpmt	Unfunded Commitments Loans Heldfor Investment UnfundedCommitmentsLoansHeldforInvestment	626155000	USD
CY2018Q4	gpmt	Numberof Loans Heldfor Investment NumberofLoansHeldforInvestment	92	loan
CY2018Q4	gpmt	Weighted Average Coupon Rate Loans Heldfor Investment WeightedAverageCouponRateLoansHeldforInvestment	0.065
CY2018	gpmt	Weighted Average Yearsto Maturity Loans Heldfor Investment WeightedAverageYearstoMaturityLoansHeldforInvestment	P2Y
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3927095000	USD
CY2019Q3	gpmt	Loans Heldfor Investment Percentageof Total LoansHeldforInvestmentPercentageofTotal	1.000
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3167913000	USD
CY2018Q4	gpmt	Loans Heldfor Investment Percentageof Total LoansHeldforInvestmentPercentageofTotal	1.000
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3927095000	USD
CY2019Q3	gpmt	Loans Heldfor Investment Percentageof Total LoansHeldforInvestmentPercentageofTotal	1.000
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3167913000	USD
CY2018Q4	gpmt	Loans Heldfor Investment Percentageof Total LoansHeldforInvestmentPercentageofTotal	1.000
CY2019Q3	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	3700000000	USD
CY2018Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	2900000000	USD
CY2019Q2	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	3560117000	USD
CY2018Q2	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	2483606000	USD
CY2018Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	3167913000	USD
CY2017Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	2304266000	USD
CY2019Q3	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	535021000	USD
CY2018Q3	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	249532000	USD
	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	1230712000	USD
	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	851662000	USD
CY2019Q3	srt	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	164797000	USD
CY2018Q3	srt	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	24199000	USD
	srt	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	468534000	USD
	srt	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	444878000	USD
CY2019Q3	gpmt	Loans Heldfor Investment Accretion Amortizationof Discountsand Premiums LoansHeldforInvestmentAccretionAmortizationofDiscountsandPremiums	4000	USD
CY2018Q3	gpmt	Loans Heldfor Investment Accretion Amortizationof Discountsand Premiums LoansHeldforInvestmentAccretionAmortizationofDiscountsandPremiums	4000	USD
	gpmt	Loans Heldfor Investment Accretion Amortizationof Discountsand Premiums LoansHeldforInvestmentAccretionAmortizationofDiscountsandPremiums	24000	USD
	gpmt	Loans Heldfor Investment Accretion Amortizationof Discountsand Premiums LoansHeldforInvestmentAccretionAmortizationofDiscountsandPremiums	22000	USD
CY2019Q3	us-gaap	Increase Decrease In Loans Deferred Income IncreaseDecreaseInLoansDeferredIncome	-6387000	USD
CY2018Q3	us-gaap	Increase Decrease In Loans Deferred Income IncreaseDecreaseInLoansDeferredIncome	-3990000	USD
	us-gaap	Increase Decrease In Loans Deferred Income IncreaseDecreaseInLoansDeferredIncome	-14034000	USD
	us-gaap	Increase Decrease In Loans Deferred Income IncreaseDecreaseInLoansDeferredIncome	-11994000	USD
CY2019Q3	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	3137000	USD
CY2018Q3	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	3385000	USD
	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	11014000	USD
	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	9260000	USD
CY2019Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	USD
CY2018Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	USD
CY2019Q3	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	3927095000	USD
CY2018Q3	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	2708338000	USD
CY2019Q3	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	3927095000	USD
CY2018Q3	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	2708338000	USD
CY2019Q3	gpmt	Numberof Loans Heldfor Investment NumberofLoansHeldforInvestment	116	loan
CY2019Q3	us-gaap	Loans And Leases Receivable Before Fees Gross LoansAndLeasesReceivableBeforeFeesGross	3955820000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3927095000	USD
CY2018Q4	gpmt	Numberof Loans Heldfor Investment NumberofLoansHeldforInvestment	92	loan
CY2018Q4	us-gaap	Loans And Leases Receivable Before Fees Gross LoansAndLeasesReceivableBeforeFeesGross	3193641000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3167913000	USD
CY2019Q3	gpmt	Debt Securities Availableforsale Face Value DebtSecuritiesAvailableforsaleFaceValue	12798000	USD
CY2018Q4	gpmt	Debt Securities Availableforsale Face Value DebtSecuritiesAvailableforsaleFaceValue	12798000	USD
CY2019Q3	gpmt	Debt Securities Availableforsale Unrealized Gains DebtSecuritiesAvailableforsaleUnrealizedGains	32000	USD
CY2018Q4	gpmt	Debt Securities Availableforsale Unrealized Gains DebtSecuritiesAvailableforsaleUnrealizedGains	0	USD
CY2019Q3	gpmt	Debt Securities Availableforsale Unrealized Losses DebtSecuritiesAvailableforsaleUnrealizedLosses	0	USD
CY2018Q4	gpmt	Debt Securities Availableforsale Unrealized Losses DebtSecuritiesAvailableforsaleUnrealizedLosses	192000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12830000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12606000	USD
CY2019Q3	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Available For Sale Or Held For Investment PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesAvailableForSaleOrHeldForInvestment	12800000	USD
CY2018Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Available For Sale Or Held For Investment PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesAvailableForSaleOrHeldForInvestment	12600000	USD
CY2019Q3	gpmt	Heldto Maturity Securities Face Value HeldtoMaturitySecuritiesFaceValue	19594000	USD
CY2018Q4	gpmt	Heldto Maturity Securities Face Value HeldtoMaturitySecuritiesFaceValue	26696000	USD
CY2019Q3	gpmt	Heldto Maturity Securities Unamortized Premium Discount HeldtoMaturitySecuritiesUnamortizedPremiumDiscount	0	USD
CY2018Q4	gpmt	Heldto Maturity Securities Unamortized Premium Discount HeldtoMaturitySecuritiesUnamortizedPremiumDiscount	0	USD
CY2019Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	19594000	USD
CY2018Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	26696000	USD
CY2019Q3	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Held To Maturity PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesHeldToMaturity	19600000	USD
CY2018Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Held To Maturity PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesHeldToMaturity	26700000	USD
CY2019Q3	us-gaap	Cash Collateral For Borrowed Securities CashCollateralForBorrowedSecurities	11200000	USD
CY2018Q4	us-gaap	Cash Collateral For Borrowed Securities CashCollateralForBorrowedSecurities	5600000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3927095000	USD
CY2019Q3	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	3961948000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3167913000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	137355000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	91700000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	168809000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	31723000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	306164000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	123423000	USD
CY2019Q3	us-gaap	Interest Receivable InterestReceivable	10797000	USD
CY2018Q4	us-gaap	Interest Receivable InterestReceivable	10268000	USD
CY2018Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	3200980000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12830000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12830000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12606000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12606000	USD
CY2019Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	19594000	USD
CY2019Q3	us-gaap	Mortgage Backed Securities Held To Maturity Fair Value Disclosure MortgageBackedSecuritiesHeldToMaturityFairValueDisclosure	19666000	USD
CY2018Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	26696000	USD
CY2018Q4	us-gaap	Mortgage Backed Securities Held To Maturity Fair Value Disclosure MortgageBackedSecuritiesHeldToMaturityFairValueDisclosure	26611000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	137355000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	137355000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	91700000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	91700000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	168809000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	168809000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	31723000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	31723000	USD
CY2019Q3	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1724912000	USD
CY2019Q3	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1724912000	USD
CY2018Q4	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1500543000	USD
CY2018Q4	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1500543000	USD
CY2019Q3	us-gaap	Beneficial Interest BeneficialInterest	1124820000	USD
CY2019Q3	gpmt	Securitized Debt Obligations Fair Value Disclosure SecuritizedDebtObligationsFairValueDisclosure	1136007000	USD
CY2018Q4	us-gaap	Beneficial Interest BeneficialInterest	654263000	USD
CY2018Q4	gpmt	Securitized Debt Obligations Fair Value Disclosure SecuritizedDebtObligationsFairValueDisclosure	654330000	USD
CY2019Q3	gpmt	Asset Specific Financings AssetSpecificFinancings	114080000	USD
CY2019Q3	gpmt	Asset Specific Financings AssetSpecificFinancings	114080000	USD
CY2018Q4	gpmt	Asset Specific Financings AssetSpecificFinancings	0	USD
CY2018Q4	gpmt	Asset Specific Financings AssetSpecificFinancings	0	USD
CY2019Q3	gpmt	Revolving Credit Facilities RevolvingCreditFacilities	0	USD
CY2019Q3	gpmt	Revolving Credit Facilities RevolvingCreditFacilities	0	USD
CY2018Q4	gpmt	Revolving Credit Facilities RevolvingCreditFacilities	75000000	USD
CY2018Q4	gpmt	Revolving Credit Facilities RevolvingCreditFacilities	75000000	USD
CY2019Q3	us-gaap	Convertible Notes Payable ConvertibleNotesPayable	269241000	USD
CY2019Q3	us-gaap	Convertible Debt Fair Value Disclosures ConvertibleDebtFairValueDisclosures	283470000	USD
CY2018Q4	us-gaap	Convertible Notes Payable ConvertibleNotesPayable	268138000	USD
CY2018Q4	us-gaap	Convertible Debt Fair Value Disclosures ConvertibleDebtFairValueDisclosures	270731000	USD
CY2019Q3	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1700000000	USD
CY2018Q4	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1500000000	USD
CY2019Q3	us-gaap	Assets Sold Under Agreements To Repurchase Interest Rate AssetsSoldUnderAgreementsToRepurchaseInterestRate	0.0422
CY2018Q4	us-gaap	Assets Sold Under Agreements To Repurchase Interest Rate AssetsSoldUnderAgreementsToRepurchaseInterestRate	0.0461
	us-gaap	Repurchase Agreement Counterparty Weighted Average Maturity Of Agreements1 RepurchaseAgreementCounterpartyWeightedAverageMaturityOfAgreements1	P1Y10M24D
CY2018	us-gaap	Repurchase Agreement Counterparty Weighted Average Maturity Of Agreements1 RepurchaseAgreementCounterpartyWeightedAverageMaturityOfAgreements1	P0Y10M24D
CY2018Q4	gpmt	Asset Specific Financings AssetSpecificFinancings	0	USD
CY2019Q3	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1724912000	USD
CY2018Q4	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1500543000	USD
CY2019Q3	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1724912000	USD
CY2018Q4	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1500543000	USD
CY2019Q3	us-gaap	Assets Sold Under Agreements To Repurchase Interest Rate AssetsSoldUnderAgreementsToRepurchaseInterestRate	0.0422
CY2018Q4	us-gaap	Assets Sold Under Agreements To Repurchase Interest Rate AssetsSoldUnderAgreementsToRepurchaseInterestRate	0.0461
CY2019Q3	us-gaap	Assets Sold Under Agreements To Repurchase Market Value AssetsSoldUnderAgreementsToRepurchaseMarketValue	2317335000	USD
CY2018Q4	us-gaap	Assets Sold Under Agreements To Repurchase Market Value AssetsSoldUnderAgreementsToRepurchaseMarketValue	2054774000	USD
CY2019Q3	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1724912000	USD
CY2019Q3	us-gaap	Repurchase Agreement Counterparty Amount At Risk RepurchaseAgreementCounterpartyAmountAtRisk	595883000	USD
CY2018Q4	us-gaap	Assets Sold Under Agreements To Repurchase Repurchase Liability AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability	1500544000	USD
CY2018Q4	us-gaap	Repurchase Agreement Counterparty Amount At Risk RepurchaseAgreementCounterpartyAmountAtRisk	557773000	USD
CY2019Q3	gpmt	Asset Specific Financings AssetSpecificFinancings	114100000	USD
CY2019Q3	us-gaap	Longterm Debt Weighted Average Interest Rate LongtermDebtWeightedAverageInterestRate	0.040
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CY2018Q4	gpmt	Asset Specific Financings AssetSpecificFinancings	0	USD
CY2019Q3	gpmt	Asset Specific Financings AssetSpecificFinancings	114080000	USD
CY2019Q3	us-gaap	Convertible Notes Payable ConvertibleNotesPayable	269200000	USD
CY2018Q4	us-gaap	Convertible Notes Payable ConvertibleNotesPayable	268100000	USD
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CY2018Q4	gpmt	Revolving Credit Facilities RevolvingCreditFacilities	75000000.0	USD
CY2018Q4	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.052
CY2019Q3	us-gaap	Beneficial Interest BeneficialInterest	1100000000	USD
CY2018Q4	us-gaap	Beneficial Interest BeneficialInterest	654300000	USD
CY2019Q3	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0372
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CY2019Q3	gpmt	Management Agreement Termination Fee Factor ManagementAgreementTerminationFeeFactor	3
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CY2019Q3	gpmt	Unfunded Commitments Loans Heldfor Investment UnfundedCommitmentsLoansHeldforInvestment	667000000.0	USD
CY2018Q4	gpmt	Unfunded Commitments Loans Heldfor Investment UnfundedCommitmentsLoansHeldforInvestment	626200000	USD
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CY2019Q3	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
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CY2019Q3	us-gaap	Preferred Stock Redemption Price Per Share PreferredStockRedemptionPricePerShare	1000
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CY2019Q3	us-gaap	Preferred Stock Redemption Price Per Share PreferredStockRedemptionPricePerShare	1000
CY2019Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	25000	USD
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CY2018Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	25000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	75000	USD
CY2017Q2	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	195000000.0	USD
CY2017Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	181900000	USD
CY2017Q2	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	13100000	USD
CY2017Q4	gpmt	Two Harbors Investment Corp Distributionof Special Dividend Shares TwoHarborsInvestmentCorpDistributionofSpecialDividendShares	33071000	shares
CY2019Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	130200000	USD
CY2019Q1	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	1600000	USD
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	43235103	shares
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CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	54853205	shares
CY2019Q3	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	2000000	shares
CY2019Q3	gpmt	At Market Offering Number Of Shares Authorized To Be Sold AtMarketOfferingNumberOfSharesAuthorizedToBeSold	8000000	shares
CY2019Q3	gpmt	Stock Issued And Outstanding Shares At Market Offering StockIssuedAndOutstandingSharesAtMarketOffering	3242364	shares
CY2019Q3	gpmt	Stock Issued And Outstanding Value At Market Offering StockIssuedAndOutstandingValueAtMarketOffering	61200000	USD
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CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	32000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	192000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	32000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-192000	USD
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	3242306	shares
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CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	321134	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	18.04
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	150000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	19.50
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	277107	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	19.31
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	221131	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	17.38
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	136870	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	18.20
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	49997	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	19.50
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	0	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	0
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	0	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	0
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	461371	shares
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	18.75
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	321134	shares
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	18.04
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1200000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3600000	USD
CY2018Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1000000.0	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2800000	USD
CY2019Q3	gpmt	Percentof Reit Taxable Incometo Distribute PercentofREITTaxableIncometoDistribute	1
	gpmt	Weighted Average Numberof Shares Outstanding WeightedAverageNumberofSharesOutstanding	43103600	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	461371	shares
CY2019Q3	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2018Q3	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1000	USD
CY2019Q3	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2018Q3	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2000	USD
CY2019Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	0	USD
CY2018Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	0	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	0	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3000	USD
CY2018Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1000	USD
CY2018Q3	gpmt	Weighted Average Numberof Shares Outstanding WeightedAverageNumberofSharesOutstanding	43135100	shares
	gpmt	Weighted Average Numberof Shares Outstanding WeightedAverageNumberofSharesOutstanding	52017520	shares
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4000	USD
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	52492324	shares
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1000	USD
CY2019Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	17367000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	16540000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	52463000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	46303000	USD
CY2019Q3	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	0	USD
CY2018Q3	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	2207000	USD
	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	0	USD
	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	6576000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	17367000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	18747000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	52463000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	52879000	USD
CY2019Q3	gpmt	Weighted Average Numberof Shares Outstanding WeightedAverageNumberofSharesOutstanding	54391834	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	321134	shares
	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	474804	shares
	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	322509	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	54853205	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43456234	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	52492324	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43426109	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2018Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	7195378	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	7190155	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54853205	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50651612	shares
	gpmt	Antidilutive Securities Excludedfrom Computationof Earnings Per Share Interest Expense AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareInterestExpense	13500000	USD
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50616264	shares
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.00
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.07
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.32
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.00
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.04
CY2019Q3	gpmt	Antidilutive Securities Excludedfrom Computationof Earnings Per Share Interest Expense AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareInterestExpense	4500000	USD
CY2019Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	13670761	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	13665619	shares
	gpmt	Management Fee Percentof Equity ManagementFeePercentofEquity	0.015
CY2019Q3	us-gaap	Management Fee Expense ManagementFeeExpense	3800000	USD
	us-gaap	Management Fee Expense ManagementFeeExpense	11000000.0	USD
CY2018Q3	us-gaap	Management Fee Expense ManagementFeeExpense	3100000	USD
	us-gaap	Management Fee Expense ManagementFeeExpense	9400000	USD
	us-gaap	Incentive Fee Expense IncentiveFeeExpense	200000	USD
CY2019Q3	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	1700000	USD
	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	10000000.0	USD
CY2018Q3	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	1500000	USD
	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	6700000	USD
	gpmt	Related Party Costs Per Share RelatedPartyCostsPerShare	0.20
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1200000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3600000	USD
CY2018Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1000000.0	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2800000	USD

Files In Submission

Name	View Source	Status
0001703644-19-000099-index-headers.html	Edgar Link	pending
0001703644-19-000099-index.html	Edgar Link	pending
0001703644-19-000099.txt	Edgar Link	pending
0001703644-19-000099-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
gpmt-20190930.xsd	Edgar Link	pending
gpmt-20190930_cal.xml	Edgar Link	unprocessable
gpmt-20190930_def.xml	Edgar Link	unprocessable
gpmt-20190930_lab.xml	Edgar Link	unprocessable
gpmt-20190930_pre.xml	Edgar Link	unprocessable
gpmt930201910qdocument.htm	Edgar Link	pending
gpmt930201910qdocument_htm.xml	Edgar Link	completed
gpmtexh93019311.htm	Edgar Link	pending
gpmtexh93019312.htm	Edgar Link	pending
gpmtexh93019321.htm	Edgar Link	pending
gpmtexh93019322.htm	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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R80.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$GPMT
Granite Point Mortgage Trust Inc. Stock $gpmt

2019 Q3 Form 10-Q Financial Statement

#000170364419000099 Filed on November 05, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPMT Granite Point Mortgage Trust Inc. Stock $gpmt

2019 Q3 Form 10-Q Financial Statement

#000170364419000099 Filed on November 05, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPMT
Granite Point Mortgage Trust Inc. Stock $gpmt