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Derivative Instruments and Hedging Activities (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |
Total return swap income | $ 2,154,000 | $ 2,184,000 | $ 6,174,000 | $ 6,682,000 |
Multifamily Housing Mortgage Revenue Bonds [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Bond subject to interest rate caps | 255,600,000 |  | 255,600,000 |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | $ 175,000,000.0 |  | $ 175,000,000.0 |  |
Interest rate | 2.30% |  | 2.30% |  |
Aggregate carrying value of the interest rate swap contracts, asset | $ 500,000 |  | $ 500,000 |  | $ 5,800,000
Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Aggregate carrying value of the interest rate swap contracts, liability | 0 |  | 0 |  | 0
Not Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 9,900,000 |  | 9,900,000 |  |
Not Designated as Hedging Instrument [Member] | Total Return Swap, Callable [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 255,600,000 |  | 255,600,000 |  |
Derivative, fair value, net | $ 0 |  | $ 0 |  | $ 0

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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