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Shareholders' Equity (Details) |  |  |  |  |  |  |  | 12 Months Ended | 103 Months Ended | 146 Months Ended | 162 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2018 $ / shares | May 18, 2018 $ / shares | Nov. 07, 2017 $ / shares | May 16, 2017 $ / shares | Nov. 09, 2016 $ / shares | May 24, 2016 USD ($) $ / shares | Jul. 16, 2014 | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | May 15, 2018 USD ($) | Jun. 02, 2016 USD ($) shares | May 19, 2015 shares
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  | 783,776 | 522,134 | 736,171 |  |  | 13,096,804 |  |  |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  | $ 27,942,765 | $ 18,234,163 | $ 20,139,954 |  |  | $ 188,521,718 |  |  |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  | $ 35.65 | $ 34.92 | $ 27.36 |  |  | $ 14.39 |  |  |
Dividends declared (per share) | $ / shares |  |  |  |  |  |  |  | $ 0.32 | $ 0.26 | $ 0.24 |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  | 1.5 |  |  |  |  |  |  |  |  |
Cash dividends paid | $ |  |  |  |  |  |  |  | $ 16,700,000 | $ 13,700,000 | $ 12,700,000 |  |  |  |  |  |
Regular Semi-Annual Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (per share) | $ / shares | $ 0.16 | $ 0.16 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.11 |  |  |  |  |  |  |  |  |  |
Open market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000.0 | 5,700,000.0
Stock repurchase program amount authorized, value | $ |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  | $ 15,000,000.0 | $ 25,000,000 |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  | 252,272 | 8,676 | 165,598 | 4,095,767 |  |  |  |  |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  | $ 8,373,698 | $ 283,654 | $ 4,440,658 | $ 69,605,813 |  |  |  |  |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  | $ 33.19 | $ 32.69 | $ 26.82 | $ 16.99 |  |  |  |  |
401(k) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  | 497,753 | 467,580 | 540,501 |  |  | 7,047,776 |  |  |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  | $ 18,472,442 | $ 16,336,084 | $ 14,875,850 |  |  | $ 100,541,247 |  |  |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  | $ 37.11 | $ 34.94 | $ 27.52 |  |  | $ 14.27 |  |  |
Directors & employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  | 33,751 | 45,878 | 30,072 |  | 1,953,261 |  |  |  |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  | $ 1,096,625 | $ 1,614,425 | $ 823,446 |  | $ 18,374,658 |  |  |  |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  | $ 32.49 | $ 35.19 | $ 27.38 |  | $ 9.41 |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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