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Shareholders' Equity (Details) - USD ($) |  |  |  |  |  |  | 12 Months Ended | 115 Months Ended | 158 Months Ended | 174 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 10, 2020 | May 15, 2020 | Nov. 06, 2019 | May 20, 2019 | Nov. 08, 2018 | May 18, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Mar. 13, 2020 | Mar. 05, 2019 | May 16, 2018 | May 19, 2015
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Repurchase |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 | $ 20,000,000 | $ 15,000,000 |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 565,882 | 454,430 | 783,776 |  |  | 14,117,116 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 31,229,000 | $ 20,793,000 | $ 27,943,000 |  |  | $ 240,544,000 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 55.19 | $ 45.76 | $ 35.65 |  |  | $ 17.04 |  |  |  |
Dividends declared (in dollars per share) |  |  |  |  |  |  | $ 0.38 | $ 0.32 | $ 0.32 |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  | $ 19,800,000 | $ 16,600,000 | $ 16,700,000 |  |  |  |  |  |  |
Regular Semi-Annual Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.19 | $ 0.19 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.16 |  |  |  |  |  |  |  |  |  |
Open market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,700,000
Stock repurchased during period (in shares) |  |  |  |  |  |  | 103,689 | 5,799 | 252,272 | 4,205,255 |  |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 4,987,000 | $ 200,000 | $ 8,374,000 | $ 74,793,000 |  |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 48.10 | $ 34.46 | $ 33.19 | $ 17.79 |  |  |  |  |  |
401(k) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 438,921 | 419,963 | 497,753 |  |  | 7,906,660 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 25,073,000 | $ 19,386,000 | $ 18,472,000 |  |  | $ 145,000,000 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 57.12 | $ 46.16 | $ 37.11 |  |  | $ 18.34 |  |  |  |
Directors & employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 23,272 | 28,668 | 33,751 |  | 2,005,201 |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 1,169,000 | $ 1,207,000 | $ 1,097,000 |  | $ 20,751,000 |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 50.23 | $ 42.11 | $ 32.49 |  | $ 10.35 |  |  |  |  |

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