[Line Items] for Schedule of Shareholders' Equity [Table]

No definition available.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Reference 3: 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)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Stockholders' Equity (Details) - USD ($)				1 Months Ended	3 Months Ended		6 Months Ended		73 Months Ended	116 Months Ended	132 Months Ended
Stockholders' Equity (Details) - USD ($)	May 24, 2016	Oct. 29, 2015	May 19, 2015	Aug. 04, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2016	Jun. 02, 2016
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)							301,505	275,784			11,356,228
Aggregate price of shares repurchased since inception							$ 7,673,623	$ 6,444,631			$ 129,878,460
Average price of shares repurchased since inception (per share)							$ 25.45	$ 23.37			$ 11.44
Cash dividends declared per common share					$ 0.11	$ 0.11	$ 0.11	$ 0.11
Dividend Declared [Member]
Schedule of Shareholders' Equity [Line Items]
Cash dividends declared per common share	$ 0.11	$ 0.11	$ 0.11
Subsequent Event [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)				300,000
Aggregate price of shares repurchased since inception				$ 1,800,000
2010 Stock Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchase program amount authorized (in shares)			5,700,000.0									2,000,000.0
Stock Repurchase Program, Authorized Amount	$ 25,000,000											$ 25,000,000
Stock repurchased during period (in shares)							10,230	0	3,679,451
Aggregate price of shares repurchased since inception							$ 265,402	$ 0	$ 56,773,205
Average price of shares repurchased since inception (per share)							$ 25.94	$ 0.00	$ 15.43
2005 401(k) Stock Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)							274,147	264,535			5,816,089
Aggregate price of shares repurchased since inception							$ 6,967,393	$ 6,177,178			$ 57,824,264
Average price of shares repurchased since inception (per share)							$ 25.41	$ 23.35			$ 9.94
2006 Director and Officer Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)							17,128	11,249		1,860,688
Aggregate price of shares repurchased since inception							$ 440,828	$ 267,453		$ 15,280,991
Average price of shares repurchased since inception (per share)							$ 25.74	$ 23.78		$ 8.21