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Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 293,844 $ 279,532 $ 254,839
Other comprehensive income (loss) before reclassifications (1,466) (1,483) 2,596
Amounts reclassified from accumulated other comprehensive income (1,158) (833) (1,420)
Net current period other comprehensive (loss) income (2,624) (2,316) 1,176
Balance 320,054 293,844 279,532
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (11,327) (9,011) (10,187)
Net current period other comprehensive (loss) income (2,624) (2,316) 1,176
Balance (13,951) (11,327) (9,011)
Securities Available-For-Sale and Transferred Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (696) 1,625 (5,337)
Other comprehensive income (loss) before reclassifications (1,318) (938) 8,459
Amounts reclassified from accumulated other comprehensive income (1,715) (1,383) (1,497)
Net current period other comprehensive (loss) income (3,033) (2,321) 6,962
Balance (3,729) (696) 1,625
Pension And Post-Retirement Obligations [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (10,631) (10,636) (4,850)
Other comprehensive income (loss) before reclassifications (148) (545) (5,863)
Amounts reclassified from accumulated other comprehensive income 557 550 77
Net current period other comprehensive (loss) income 409 5 (5,786)
Balance $ (10,222) $ (10,631) $ (10,636)