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Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 177,127   177,127          
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax     $ 607 $ 2,600        
Other comprehensive loss before reclassifications $ 8,666 $ (2,368) 23,001 (25,778)        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax 0   0 0        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax 0   0 0        
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets               $ (995)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 0 0 0 0        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax (301) 0 (507) 0        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 480 0 480 2,024        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 480   480 2,024        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax 9,447 (2,368) 23,988 (23,754)        
Other comprehensive income (loss) 9,146 (2,368) 23,481 (23,754)        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax 8,967 (2,368) 23,508 (25,778)        
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 0 0 0 0        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax (301) 0 (507) 0        
Changes in pension plan assets and benefit obligations, Net-of-tax amount (29,672) (26,701) (29,672) (26,701) $ 29,672 $ 29,672 $ 26,701 23,526
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax (507) 0 (507) 0 (206) 0 0 0
Unrealized gains on available-for-sale securities, Net-of-tax amount 3,872 (28,308) 3,872 (28,308) (5,575) (20,116) (25,940) (2,928)
Total accumulated other comprehensive income (loss), Net-of-tax amount $ (26,307) (55,009) $ (26,307) $ (55,009) $ (35,453) $ (49,788) $ (52,641) (26,454)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax   $ 0            
Accumulated Other Comprehensive Income (loss) [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets               (3,806)
Accumulated Other Comprehensive Income (loss) [Member] | Pension Plan [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets               (3,175)
Accumulated Other Comprehensive Income (loss) [Member] | Debt Securities [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets               (631)
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income (loss) [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets               (995)
Adjustments for New Accounting Pronouncement [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Changes in pension plan assets and benefit obligations, Net-of-tax amount               23,526
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax               0
Unrealized gains on available-for-sale securities, Net-of-tax amount               (3,923)
Total accumulated other comprehensive income (loss), Net-of-tax amount               $ (27,449)