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Employee Benefit Plans (Projected Benefit Payments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
BancShares Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 626,746 | $ 659,023
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | 50,000 | 50,000
2018 | 27,050 |
2019 | 29,137 |
2020 | 31,260 |
2021 | 33,168 |
2022 | 35,031 |
2023-2027 | 201,126 |
Bancorporation Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Accumulated Benefit Obligation | 152,344 | $ 157,613
2018 | 7,044 |
2019 | 7,473 |
2020 | 7,863 |
2021 | 8,284 |
2022 | 8,685 |
2023-2027 | $ 48,868 |

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