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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details 2) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2019 | May 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Cash in escrow |  |  |  |  | $ 88,329,000 |  | $ 126,205,000 | $ 225,704,000
Net carrying value of apartment communities and improved land parcels securing debt |  |  |  |  | 1,693,511,000 |  |  |
Unsecured Notes 3.30 Percent [Domain] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 450,000,000 |  |
Proceeds from Issuance of Debt |  | $ 446,877,000 |  |  |  |  |  |
Notes Payable Maturities 2029 [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 30,250,000 |  |  |
Current interest rate (as a percent) |  |  |  |  | 3.26% |  |  |
Notes Payable Maturities 2029 [Member] | Unsecured notes |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.30% |  |  |
Variable Rate Unsecured Term Loan $250 Million [Member] | Unsecured notes |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 250,000,000 |  |  |  |
Variable Rate Unsecured Term Loan $100 Million | Unsecured notes |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000,000 |  |  |  |
Variable Rate Unsecured Term Loan $100 Million | LIBOR | Unsecured notes |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  | 0.90% | 0.90% |  |  |
Variable Rate Unsecured Term Loan $150 Million | Unsecured notes |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 150,000,000 |  |  |  |
Variable Rate Unsecured Term Loan $150 Million | LIBOR | Unsecured notes |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  | 0.85% |  |  |
Unsecured Notes 3.30 Percent [Domain] | Unsecured notes |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 3.30% |  |
Current interest rate (as a percent) |  |  |  |  |  | 3.66% |  |
Line of Credit [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  |  | $ 1,750,000,000 |  | 1,500,000,000 |
Percent of Credit Facility Available to Competitive Bid Option |  |  |  |  | 65.00% |  |  |
Annual facility fee, percentage |  |  |  |  | 0.125% |  |  |
Annual facility fee |  |  |  |  | $ 2,188,000 |  |  |
Outstanding balance of letters of credit |  |  |  |  | $ 17,813,000 |  | $ 39,810,000 |
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) |  |  |  |  | 2.79% |  |  |
Other Letter of Credit [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Outstanding balance of letters of credit |  |  |  |  | $ 18,964,000 |  |  |
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) |  |  |  |  | 3.20% |  | 3.40% |
Minimum | Variable Rate Unsecured Term Loan $150 Million | LIBOR | Unsecured notes |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  | 0.85% |  |  |  |
Minimum | Line of Credit [Member] | LIBOR |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  | 0.70% |  |  |
Maximum | Variable Rate Unsecured Term Loan $150 Million | LIBOR | Unsecured notes |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  | 1.50% |  |  |  |
Maximum | Line of Credit [Member] | LIBOR |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  | 1.45% |  |  |
Avalon Natick [Member] | Notes Payable Maturities 2019, Fixed Rate [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Repayments of Secured Debt |  |  | $ 13,363,000 |  |  |  |  |
Avalon Natick [Member] | Notes Payable Maturities 2019, Variable Rate [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Repayments of Secured Debt |  |  | $ 33,854,000 |  |  |  |  |
Eaves Mission Viejo [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Cash in escrow |  |  |  |  |  | $ 3,706,000 |  |
Eaves Mission Viejo [Member] | Notes Payable Maturities 2025 | Secured Debt [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Repayments of Secured Debt |  | 7,635,000 |  |  |  |  |  |
AVA Nob Hill [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Cash in escrow |  |  |  |  |  | 10,584,000 |  |
AVA Nob Hill [Member] | Notes Payable Maturities 2025 | Secured Debt [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Repayments of Secured Debt |  | 20,800,000 |  |  |  |  |  |
Avalon Campbell [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Cash in escrow |  |  |  |  |  | 22,622,000 |  |
Avalon Campbell [Member] | Notes Payable Maturities 2025 | Secured Debt [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Repayments of Secured Debt |  | 38,800,000 |  |  |  |  |  |
Eaves Pacifica [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Cash in escrow |  |  |  |  |  | $ 10,263,000 |  |
Eaves Pacifica [Member] | Notes Payable Maturities 2025 | Secured Debt [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Repayments of Secured Debt |  | $ 17,600,000 |  |  |  |  |  |
Archstone Lexington [Member] | Notes Payable Maturities 2020 [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |
Repayments of Secured Debt | $ 21,700,000 |  |  |  |  |  |  |

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