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Derivative Instruments and Hedging Activities - Interest Rate Swaps (Details) - Derivatives Designated as Hedging Instruments - Cash Flow Hedging - Interest rate swaps - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 90,000,000 | $ 225,000,000
Weighted Average Fixed Interest Rate | 0.88% | 0.90%
Weighted Average Variable Interest Rate | 1.24% | 0.75%
2017 |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 80,000,000 | $ 215,000,000
Weighted Average Fixed Interest Rate | 0.71% | 0.83%
Weighted Average Variable Interest Rate | 1.23% | 0.74%
2019 |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 10,000,000 | $ 10,000,000
Weighted Average Fixed Interest Rate | 2.25% | 2.25%
Weighted Average Variable Interest Rate | 1.32% | 0.97%
Agency IOs |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 5,000,000 | $ 5,000,000
Weighted Average Fixed Interest Rate | 1.80% | 1.80%
Weighted Average Variable Interest Rate | 1.33% | 1.00%
Agency IOs | 2026 |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 5,000,000 | $ 5,000,000
Weighted Average Fixed Interest Rate | 1.80% | 1.80%
Weighted Average Variable Interest Rate | 1.33% | 1.00%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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