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Compensation Plans - Schedule of Various Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 4,178 | $ 4,032 | $ 3,452
Total unrecognized compensation cost for nonvested stock units | $ 5,000 |  |
Expected years to recognize unearned compensation | 2 years |  |
Weighted average fair value (usd per share) | $ 38,090.00 | $ 47,460 |
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 468 | $ 364 | 174
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 2,613 | 1,969 | 1,211
Total fair value at vesting date | 1,702 | 1,067 | 1,544
Total unrecognized compensation cost for nonvested stock units | $ 3,899 | $ 3,417 | $ 2,175
Expected years to recognize unearned compensation | 1 year 10 months 24 days | 1 year 10 months 24 days | 2 years
Stock Options and SSARs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Intrinsic value of option/SSAR exercises on date of exercise | $ 597 | $ 407 | $ 2,469
Stock Plan for Non-Management Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares issued | 15,901,000 | 11,382,000 | 11,750,000
Weighted average fair value (usd per share) | $ 30.28 | $ 41.63 | $ 50.74

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