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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 |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |

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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 + Details
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