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Retirement and Share-based Compensation Plans (Changes in Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Payment Arrangement [Abstract] |  |  |  |
Outstanding, number of shares | 828,913 | 1,221,865 | 1,980,265 | 2,918,946
Outstanding, weighted-average exercise price per share | $ 19.91 | $ 17.41 | $ 16.20 | $ 16.06
Outstanding, total exercise price | $ 16,506 | $ 21,273 | $ 32,084 | $ 46,885
Granted, number of shares | 0 | 0 | 0 |
Granted, weighted-average exercise price per share | $ 0 | $ 0 | $ 0 |
Granted, total exercise price | $ 0 | $ 0 | $ 0 |
Canceled, number of shares | (22,600) | (40,850) | (57,200) |
Canceled, weighted-average exercise price per share | $ 18.14 | $ 18.87 | $ 13.66 |
Canceled, total exercise price | $ (410) | $ (771) | $ (781) |
Exercised, number of shares | (370,352) | (717,550) | (881,481) |
Exercised, weighted-average exercise price per share | $ 11.76 | $ 13.99 | $ 15.90 |
Exercised, total exercise price | $ (4,357) | $ (10,040) | $ (14,020) |
Stock Option Plans, 2000 Director Stock Option Plan, 2009 Employee Incentive Plan, 2011 Directors Stock Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized | 2,975,000 |  |  |
Duration of award | 10 years |  |  |
Stock Option Plans, 2000 Director Stock Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 6 months |  |  |
Stock Option Plans, 2011 Director Stock Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Number of shares available for future grant | 18,000 |  |  |
Stock Option Plans, Independent Insurance Agent Stock Option Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized | 8,000,000 |  |  |

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