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Employee Benefit Plans (Components Of Pension Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
BancShares Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 3,090 $ 3,603 $ 6,310 $ 7,203
Interest cost 7,269 6,750 14,450 13,498
Expected return on assets (9,167) (8,299) (18,326) (16,594)
Amortization of prior service cost 52 52 104 105
Amortization of net actuarial loss 1,830 2,835 3,430 5,668
Total pension expense 3,074 4,941 5,968 9,880
Bancorporation Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 633 932 1,283 1,865
Interest cost 1,713 1,627 3,388 3,255
Expected return on assets (2,771) (2,870) (5,550) (5,739)
Total pension expense $ (425) $ (311) $ (879) $ (619)