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Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income before reclassifications $ 1,022 $ 11,680    
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 0 0    
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax 0 0    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0    
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 1,022 11,680    
Other comprehensive income (loss) 1,022 11,680    
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax 1,022 11,680    
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax   0    
Changes in pension plan assets and benefit obligations, Net-of-tax amount (14,740) (15,351) $ 14,740 $ 15,351
Unrealized gains on available-for-sale securities, Net-of-tax amount (1,983) 11,388 (3,005) (292)
Total accumulated other comprehensive income (loss), Net-of-tax amount (16,723) $ (3,963) $ (17,745) $ (15,643)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax $ 0