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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of year $ (11,327) $ (9,011)    
Other comprehensive income (loss) before reclassifications 7,490 3,960    
Amounts reclassified from accumulated other comprehensive loss (268) (564)    
Net current period other comprehensive income (loss) 7,222 3,396    
Balance at end of period (11,327) (9,011) $ (4,105) $ (5,615)
Securities Available For Sale and Transferred Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of year (696) 1,625    
Other comprehensive income (loss) before reclassifications 7,490 3,960    
Amounts reclassified from accumulated other comprehensive loss (407) (699)    
Net current period other comprehensive income (loss) 7,083 3,261    
Balance at end of period (696) 1,625 6,387 4,886
Pension And Post-Retirement Obligations [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of year $ (10,631) $ (10,636)    
Other comprehensive income (loss) before reclassifications    
Amounts reclassified from accumulated other comprehensive loss $ 139 $ 135    
Net current period other comprehensive income (loss) 139 135    
Balance at end of period $ (10,631) $ (10,636) $ (10,492) $ (10,501)