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Treasury Stock (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Oct. 23, 2017
Class of Stock [Line Items]
Shares available for repurchase (in shares)	114,271
Shares repurchased (in shares)	330,000	40,000
Cost of shares repurchased	$ 20,217	$ 2,188
Scenario, Forecast
Class of Stock [Line Items]
Shares available for repurchase (in shares)			386,434
Increase in shares available for repurchase (in shares)			300,000

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Number of shares that have been repurchased during the period and are being held in treasury.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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