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Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, Fair Value, Net	$ (16,649)	$ (2,542)
Short [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	525,253	553,843
Derivative, Fair Value, Net	$ (17,118)	$ (3,470)
Weighted Average Pay Rate	1.59%	1.63%
Weighted Average Receive Rate	0.62%	0.36%
Derivative, Average Remaining Maturity	5 years 58 days	5 years 245 days
Short [Member] | Year 2016 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 48,000	$ 48,000
Derivative, Fair Value, Net	$ (79)	$ (83)
Weighted Average Pay Rate	0.80%	0.80%
Weighted Average Receive Rate	0.62%	0.39%
Derivative, Average Remaining Maturity	190 days	281 days
Short [Member] | Year 2017 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 74,750	$ 74,750
Derivative, Fair Value, Net	$ (546)	$ (445)
Weighted Average Pay Rate	1.21%	1.21%
Weighted Average Receive Rate	0.63%	0.41%
Derivative, Average Remaining Maturity	1 year 124 days	1 year 215 days
Short [Member] | Year 2018 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 71,529	$ 71,529
Derivative, Fair Value, Net	$ (559)	$ 80
Weighted Average Pay Rate	1.11%	1.11%
Weighted Average Receive Rate	0.62%	0.34%
Derivative, Average Remaining Maturity	2 years 11 days	2 years 102 days
Short [Member] | Year 2020 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 107,461	$ 119,893
Derivative, Fair Value, Net	$ (2,371)	$ 220
Weighted Average Pay Rate	1.50%	1.51%
Weighted Average Receive Rate	0.62%	0.33%
Derivative, Average Remaining Maturity	4 years 29 days	4 years 131 days
Short [Member] | Year 2021 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 10,400
Derivative, Fair Value, Net	$ 1
Weighted Average Pay Rate	1.15%
Weighted Average Receive Rate	0.62%
Derivative, Average Remaining Maturity	4 years 318 days
Short [Member] | Year 2022 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 19,444	$ 19,444
Derivative, Fair Value, Net	$ (587)	$ 86
Weighted Average Pay Rate	1.76%	1.76%
Weighted Average Receive Rate	0.62%	0.34%
Derivative, Average Remaining Maturity	6 years 95 days	6 years 186 days
Short [Member] | Year 2023 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 131,400	$ 131,400
Derivative, Fair Value, Net	$ (7,080)	$ (1,367)
Weighted Average Pay Rate	2.10%	2.10%
Weighted Average Receive Rate	0.63%	0.38%
Derivative, Average Remaining Maturity	7 years 51 days	7 years 142 days
Short [Member] | Year 2024 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 9,200	$ 9,200
Derivative, Fair Value, Net	$ (428)	$ 11
Weighted Average Pay Rate	1.99%	1.99%
Weighted Average Receive Rate	0.61%	0.32%
Derivative, Average Remaining Maturity	8 years 4 days	8 years 95 days
Short [Member] | Year 2025 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 34,022	$ 58,560
Derivative, Fair Value, Net	$ (1,503)	$ (5)
Weighted Average Pay Rate	2.05%	2.06%
Weighted Average Receive Rate	0.62%	0.33%
Derivative, Average Remaining Maturity	8 years 314 days	9 years 117 days
Short [Member] | Year 2043 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 19,047	$ 21,067
Derivative, Fair Value, Net	$ (3,966)	$ (1,967)
Weighted Average Pay Rate	3.02%	3.03%
Weighted Average Receive Rate	0.62%	0.36%
Derivative, Average Remaining Maturity	27 years 51 days	27 years 142 days
Long [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 12,700	$ 9,700
Derivative, Fair Value, Net	$ 1,265	$ 857
Weighted Average Pay Rate	0.62%	0.32%
Weighted Average Receive Rate	2.69%	3.00%
Derivative, Average Remaining Maturity	9 years 168 days	9 years 201 days
Long [Member] | Year 2025 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 9,700	$ 9,700
Derivative, Fair Value, Net	$ 1,255	$ 857
Weighted Average Pay Rate	0.62%	0.32%
Weighted Average Receive Rate	3.00%	3.00%
Derivative, Average Remaining Maturity	9 years 110 days	9 years 201 days
Long [Member] | Year 2026 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 3,000
Derivative, Fair Value, Net	$ 10
Weighted Average Pay Rate	0.63%
Weighted Average Receive Rate	1.68%
Derivative, Average Remaining Maturity	10 years 4 days

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+ References

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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

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

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