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Employee Benefit Plans (Amounts Recognized in the Financial Statements) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
BancShares Plan |  |
Amounts recognized in the consolidated balance sheets |  |
Other assets | $ 552 | $ 0
Other liabilities | 0 | (36,949)
Net asset (liability) recognized | 552 | (36,949)
Amount recognized in accumulated other comprehensive income |  |
Net loss (gain) | 130,564 | 125,745
Less prior service cost | 57 | 137
Accumulated other comprehensive loss, excluding income taxes | 130,621 | 125,882
Actuarial loss | 8,455 |
Prior service cost | 57 |
Total | 8,512 |
Bancorporation Plan |  |
Amounts recognized in the consolidated balance sheets |  |
Other assets | 0 | 0
Other liabilities | (10,993) | (889)
Net asset (liability) recognized | (10,993) | (889)
Amount recognized in accumulated other comprehensive income |  |
Net loss (gain) | 32,409 | 19,117
Less prior service cost | 0 | 0
Accumulated other comprehensive loss, excluding income taxes | 32,409 | $ 19,117
Actuarial loss | 2,505 |
Prior service cost | 0 |
Total | $ 2,505 |

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