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Shareholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  | 12 Months Ended | 79 Months Ended | 122 Months Ended | 138 Months Ended |
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Nov. 09, 2016 $ / shares | May 24, 2016 USD ($) $ / shares | Oct. 29, 2015 $ / shares | May 19, 2015 $ / shares shares | Nov. 04, 2014 $ / shares | Jul. 16, 2014 | May 02, 2014 $ / shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Jun. 02, 2016 USD ($) shares
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  | 736,171 | 1,576,090 | 1,488,230 |  |  | 11,790,894 |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  | $ 20,139,954 | $ 37,142,974 | $ 29,283,037 |  |  | $ 142,344,788 |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  | $ 27.36 | $ 23.57 | $ 19.68 |  |  | $ 12.07 |
Dividends declared (per share) | $ / shares |  |  |  |  |  |  |  | $ 0.24 | $ 0.22 | $ 0.18 |  |  |  |
Stock split, conversion ratio |  |  |  |  |  | 1.5 |  |  |  |  |  |  |  |
Cash dividends paid | $ |  |  |  |  |  |  |  | $ 12,700,000 | $ 11,900,000 | $ 9,700,000 |  |  |  |
Regular Semi-Annual Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (per share) | $ / shares | $ 0.13 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.09 |  | $ 0.09 |  |  |  |  |  |  |
2010 Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized (in shares) | shares |  |  |  | 5,700,000.0 |  |  |  |  |  |  |  |  |  | 2,000,000.0
Stock repurchase program amount authorized, value | $ |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  | 165,598 | 1,037,590 | 1,016,717 | 3,834,819 |  |  |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  | $ 4,440,658 | $ 24,999,963 | $ 19,998,406 | $ 60,948,460 |  |  |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  | $ 26.82 | $ 24.09 | $ 19.67 | $ 15.89 |  |  |
2005 401(k) Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  | 540,501 | 512,754 | 417,172 |  |  | 6,082,443 |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  | $ 14,875,850 | $ 11,557,598 | $ 8,246,172 |  |  | $ 65,732,720 |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  | $ 27.52 | $ 22.54 | $ 19.77 |  |  | $ 10.81 |
2006 Director and Officer Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  | 30,072 | 25,746 | 54,341 |  | 1,873,632 |  |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  | $ 823,446 | $ 585,413 | $ 1,038,459 |  | $ 15,663,608 |  |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  | $ 27.38 | $ 22.74 | $ 19.11 |  | $ 8.36 |  |

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