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Employee Incentive, Deferred Compensation, And Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Share Based Compensation Allocation And Classification In Financial Statements [Abstract] |
Unvested Stock Award Activity |
|  | Units/Awards |  |  | Weighted-average grant date fair value |
Unvested December 31, 2016 |  |  | 16,276 |  |  | $ | 39.40 |
Granted |  |  | 1,422 |  |  |  | 51.24 |
Vested |  |  | (1,875 | ) |  |  | 33.59 |
Converted to restricted stock |  |  | (3,111 | ) |  |  | 39.49 |
Cancelled |  |  | (433 | ) |  |  | 33.93 |
Unvested December 31, 2017 |  |  | 12,279 |  |  | $ | 42.17 |

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- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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