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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance at beginning of year $ (654) $ (11,682) $ (11,327) $ (9,011)    
Other comprehensive income before reclassifications (1,180) 5,700 10,491 3,496    
Amounts reclassified from accumulated other comprehensive loss (127) (70) (1,125) (537)    
Net current period other comprehensive income (loss) (1,307) 5,630 9,366 2,959    
Balance at end of period (654) (11,682) (11,327) (9,011) $ (1,961) $ (6,052)
Securities Available For Sale and Transferred Securities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance at beginning of year 9,698 (1,321) (696) 1,625    
Other comprehensive income before reclassifications (1,180) 5,700 10,491 3,496    
Amounts reclassified from accumulated other comprehensive loss (266) (208) (1,543) (950)    
Net current period other comprehensive income (loss) (1,446) 5,492 8,948 2,546    
Balance at end of period 9,698 (1,321) (696) 1,625 8,252 4,171
Pension And Post-Retirement Obligations [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance at beginning of year (10,352) (10,361) (10,631) (10,636)    
Other comprehensive income before reclassifications        
Amounts reclassified from accumulated other comprehensive loss 139 138 418 413    
Net current period other comprehensive income (loss) 139 138 418 413    
Balance at end of period $ (10,352) $ (10,361) $ (10,631) $ (10,636) $ (10,213) $ (10,223)