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Benefit Plan (Components Of Net Periodic Benefit Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Other components of net periodic benefit income | $ 1,705 | $ 1,448
Total other income | 26,903 | 18,955
Employee Benefits and Share-based Compensation | 7,029 | 6,468
Other expense | 1,910 | 1,656
Total other expense | 54,308 | 48,910
Service cost | 1,637 | 1,317
Interest cost | 1,309 | 1,271
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (68) | (131)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 1,637 | 1,317
Interest cost | 1,309 | 1,271
Expected return on plan assets | (3,354) | (2,863)
Amortization of prior service cost | 0 | 0
Recognized net actuarial loss | 340 | 144
Benefit expense | (68) | (131)
Pension plan contributions | 0 | 0
Supplemental Employee Retirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 185 | 233
Interest cost | 161 | 117
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 346 | 350
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 185 | 233
Interest cost | 161 | 117
Benefit expense | $ 346 | 350
Restatement Adjustment [Member] | AccountingStandardsUpdate201707 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other components of net periodic benefit income |  | 1,448
Total other income |  | 18,955
Employee Benefits and Share-based Compensation |  | 6,468
Other expense |  | 1,656
Total other expense |  | 48,910
Scenario, Previously Reported [Member] | AccountingStandardsUpdate201707 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other components of net periodic benefit income |  | 0
Total other income |  | 17,507
Employee Benefits and Share-based Compensation |  | 5,181
Other expense |  | 1,495
Total other expense |  | $ 47,462

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- Definition Other components of net periodic benefit income + References No definition available. + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment for pension benefits. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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