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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details 2) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Credit Facility |  | $ 0 | $ 0
Net carrying value of apartment communities and improved land parcels securing debt |  | 1,382,452,000 |
Secured Debt [Member] |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  | 380,576,000 | 408,964,000
Unsecured notes |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  | 6,500,000,000 | 6,500,000,000
Notes Payable Maturities 2021 [Member] |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.37% |  |
Line of Credit [Member] |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Available borrowing capacity |  | $ 1,750,000,000 |
Annual facility fee, percentage |  | 0.125% |
Annual facility fee |  | $ 2,188,000 |
Credit Facility |  | 0 | 0
Outstanding balance of letters of credit |  | $ 2,613,000 | 2,900,000
Line of Credit [Member] | LIBOR |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  | 0.775% |
Current interest rate (as a percent) |  | 0.89% |
Other Letter of Credit [Member] |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Outstanding balance of letters of credit |  | $ 33,482,000 | $ 32,079,000
Fixed Rate Mortgage Notes Payable [Member] |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Weighted average interest rate, debt (as a percent) |  | 3.80% | 3.80%
Variable Rate Mortgage Notes Payable Unsecured Term Loan and Credit Facility [Member] |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Weighted average interest rate, debt (as a percent) |  | 1.70% | 1.70%
Avalon San Bruno II | Notes Payable Maturities 2021 [Member] | Secured Debt [Member] |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |
Repayments of Secured Debt | $ 27,795,000 |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- 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
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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