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Employee Incentive, Deferred Compensation, And Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Share Based Compensation Allocation And Classification In Financial Statements [Abstract] |
Unvested Stock Award Activity |
|  | Units |  |  | Weighted-average grant date fair value |
Unvested December 31, 2017 |  |  | 13,938 |  |  | $ | 44.31 |
Granted |  |  | 2,496 |  |  |  | 55.94 |
Vested |  |  | (2,030 | ) |  |  | 41.18 |
Cancelled |  |  | (287 | ) |  |  | 47.98 |
Unvested December 31, 2018 |  |  | 14,117 |  |  | $ | 46.75 |

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- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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