Accrued Interest Receivable

No definition available.

Name:	apts_AccruedInterestReceivable
Namespace Prefix:	apts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

amount drawn under loan agreement, when less than face amount of loan, with balance to be drawn at some later date.

+ References

No definition available.

+ Details

Name:	apts_AmountDrawnUnderLoanAgreement
Namespace Prefix:	apts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

fee on sale of loan

+ References

No definition available.

+ Details

Name:	apts_Feeonsaleofloan
Namespace Prefix:	apts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

loan commitment amount

+ References

No definition available.

+ Details

Name:	apts_Loancommitmentamount
Namespace Prefix:	apts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Monthly Interest Expense

+ References

No definition available.

+ Details

Name:	apts_MonthlyInterestExpense
Namespace Prefix:	apts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

payments received from real estate loan participants

+ References

No definition available.

+ Details

Name:	apts_Paymentsreceivedfromrealestateloanparticipants
Namespace Prefix:	apts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

real estate loan balances unfunded

+ References

No definition available.

+ Details

Name:	apts_Realestateloanbalancesunfunded
Namespace Prefix:	apts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

real estate loan participation percentage

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Gross

+ References

No definition available.

+ Details

Name:	apts_SECSchedule1229RealEstateCompaniesInvestmentinMortgageLoansonRealEstateGross
Namespace Prefix:	apts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

variable interest entity loans amount to be funded

+ References

No definition available.

+ Details

Name:	apts_Variableinterestentityloansamounttobefunded
Namespace Prefix:	apts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	srt_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from proceeds from sale of receivables arising from the mortgage note on real estate; includes collections on mortgage notes receivable that are not classified as operating cash flows.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

Name:	invest_InvestmentAxis=us-gaap_MortgageBackedSecuritiesOtherMember
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Real Estate Loans, Notes Receivable, and Lines of Credit Real Estate Loans Narrative (Details) - USD ($)				12 Months Ended
	Mar. 28, 2019	Dec. 20, 2018	Mar. 23, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Proceeds from Sale of Mortgage Loans Held-for-sale		$ 41,100,000
fee on sale of loan				$ 1,550,000
payments received from real estate loan participants				5,223,000	$ 10,425,000	$ 7,883,000
real estate loan participation percentage					25.00%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Gross				352,582,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount				352,600,000
variable interest entity loans amount to be funded				414,300,000
real estate loan balances unfunded				61,700,000
Loans Receivable, Gross, Commercial, Real Estate				352,582,000	$ 336,329,000
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate				349,482,000
Accrued Interest Receivable				25,800,000
Proceeds from Sale and Collection of Mortgage Notes Receivable					$ 41,200,000
Starkville Loan [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Gross				7,300,000
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate				5,900,000
Accrued Interest Receivable				1,200,000
Allowance for Loan and Lease Losses, Real Estate				1,400,000
Geographic Concentration Risk [Member] \| Oxford [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
amount drawn under loan agreement				84,000,000
loan commitment amount				$ 100,800,000
Mortgage Backed Securities, Other [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Monthly Interest Expense	$ 103,000
Payments to Acquire Investments	$ 18,400,000		$ 4,700,000