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Employee Benefit Plans (Present Value of Accrued Liability) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Executives Directors And Officer Of Acquired Entities [Member] |  |  |
Present Value Of Accrued Liability [Roll Forward] |  |  |
Present value of accrued liability as of January 1 | $ 37,299 | $ 38,597 |
Liability assumed in the Capital Commerce merger | 808 | 0 |
Benefit expense and interest cost | 535 | 3,262 |
Benefits paid | 4,579 | 4,560 |
Present value of accrued liability as of December 31 | 34,063 | 37,299 | $ 38,597
BancShares Plan |  |  |
Present Value Of Accrued Liability [Roll Forward] |  |  |
Benefit expense and interest cost | 7,759 | 8,569 | 11,936
Interest cost | $ 28,376 | $ 28,940 | $ 28,892
Discount rate | 4.38% | 3.76% |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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