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Employee Benefit Plans (Net Benefit Cost) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total change in pension obligation, net of tax | $ 13,981 | $ 9,720 | $ 7,069
BancShares Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Service cost | 13,582 | 12,638 | 12,618
Interest cost | 28,376 | 28,940 | 28,892
Expected return on assets | (47,867) | (42,074) | (36,643)
Amortization of prior service cost | (79) | (210) | (210)
Amortization of net actuarial loss | 13,589 | 8,855 | 6,859
Total pension expense | 7,759 | 8,569 | 11,936
Current year actuarial gain (loss) | (18,407) | (14,834) | (56,268)
Total change in pension obligation, net of tax | 4,739 | 5,769 | 49,199
Total recognized in net periodic benefit cost and other comprehensive income | 12,498 | 14,338 | 61,135
Bancorporation Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Service cost | 2,572 | 2,548 | 2,567
Interest cost | 6,357 | 6,653 | 6,775
Expected return on assets | (12,429) | (11,170) | (11,101)
Amortization of net actuarial loss | 313 | 655 | 0
Total pension expense | (3,187) | (1,314) | (1,759)
Current year actuarial gain (loss) | (13,605) | 1,889 | (14,157)
Total change in pension obligation, net of tax | 13,292 | (2,544) | 14,157
Total recognized in net periodic benefit cost and other comprehensive income | $ 10,105 | $ (3,858) | $ 12,398

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of 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)(4) -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 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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