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Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, Fair Value, Net	$ 22,716	$ 6,929
Short [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	577,430	607,571
Derivative, Fair Value, Net	$ 18,176	$ 6,347
Weighted Average Pay Rate	2.17%	1.77%
Weighted Average Receive Rate	2.33%	1.40%
Derivative, Average Remaining Maturity	5 years 282 days	4 years 197 days
Short [Member] | Year 2018 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional		$ 65,990
Derivative, Fair Value, Net		$ 187
Weighted Average Pay Rate		0.97%
Weighted Average Receive Rate		1.38%
Derivative, Average Remaining Maturity		157 days
Short [Member] | Year 2019 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional		$ 19,540
Derivative, Fair Value, Net		$ 165
Weighted Average Pay Rate		1.41%
Weighted Average Receive Rate		1.60%
Derivative, Average Remaining Maturity		1 year 186 days
Short [Member] | Year 2020 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 86,000	$ 131,900
Derivative, Fair Value, Net	$ 1,529	$ 1,514
Weighted Average Pay Rate	1.60%	1.60%
Weighted Average Receive Rate	2.33%	1.41%
Derivative, Average Remaining Maturity	1 year 209 days	2 years 142 days
Short [Member] | Year 2021 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 133,400	$ 131,400
Derivative, Fair Value, Net	$ 3,332	$ 1,194
Weighted Average Pay Rate	1.89%	1.88%
Weighted Average Receive Rate	2.34%	1.40%
Derivative, Average Remaining Maturity	2 years 241 days	3 years 150 days
Short [Member] | Year 2022 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 68,480	$ 79,044
Derivative, Fair Value, Net	$ 2,245	$ 736
Weighted Average Pay Rate	2.00%	1.97%
Weighted Average Receive Rate	2.34%	1.39%
Derivative, Average Remaining Maturity	3 years 250 days	4 years 175 days
Short [Member] | Year 2023 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 23,600	$ 54,200
Derivative, Fair Value, Net	$ 1,193	$ 873
Weighted Average Pay Rate	1.88%	1.93%
Weighted Average Receive Rate	2.34%	1.37%
Derivative, Average Remaining Maturity	4 years 222 days	5 years 172 days
Short [Member] | Year 2024 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 8,900	$ 8,900
Derivative, Fair Value, Net	$ 454	$ 142
Weighted Average Pay Rate	1.99%	1.99%
Weighted Average Receive Rate	2.34%	1.34%
Derivative, Average Remaining Maturity	5 years 186 days	6 years 95 days
Short [Member] | Year 2025 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 47,722	$ 15,322
Derivative, Fair Value, Net	$ 1,398	$ 196
Weighted Average Pay Rate	2.57%	2.04%
Weighted Average Receive Rate	2.33%	1.37%
Derivative, Average Remaining Maturity	6 years 153 days	7 years 47 days
Short [Member] | Year 2026 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 40,885	$ 40,885
Derivative, Fair Value, Net	$ 4,189	$ 2,230
Weighted Average Pay Rate	1.63%	1.63%
Weighted Average Receive Rate	2.34%	1.36%
Derivative, Average Remaining Maturity	7 years 351 days	8 years 259 days
Short [Member] | Year 2027 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 30,000	$ 48,010
Derivative, Fair Value, Net	$ 1,659	$ 235
Weighted Average Pay Rate	2.29%	2.30%
Weighted Average Receive Rate	2.35%	1.40%
Derivative, Average Remaining Maturity	8 years 217 days	9 years 139 days
Short [Member] | Year 2028 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 126,063
Derivative, Fair Value, Net	$ 1,949
Weighted Average Pay Rate	2.92%
Weighted Average Receive Rate	2.33%
Derivative, Average Remaining Maturity	9 years 300 days
Short [Member] | Year 2043 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	$ 12,380	$ 12,380
Derivative, Fair Value, Net	$ 228	$ (1,125)
Weighted Average Pay Rate	2.99%	2.99%
Weighted Average Receive Rate	2.33%	1.41%
Derivative, Average Remaining Maturity	24 years 231 days	25 years 139 days
Long [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional		$ 9,700
Derivative, Fair Value, Net		$ 563
Weighted Average Pay Rate		1.36%
Weighted Average Receive Rate		3.00%
Derivative, Average Remaining Maturity		7 years 197 days
Long [Member] | Year 2025 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional		$ 9,700
Derivative, Fair Value, Net		$ 563
Weighted Average Pay Rate		1.36%
Weighted Average Receive Rate		3.00%
Derivative, Average Remaining Maturity		7 years 197 days

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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

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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