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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
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

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+ 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

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