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Accumulated Other Comprehensive Loss (Amounts Reclassified Out Of Each Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on disposal of investment securities $ 613 $ 1,062
Interest income 24,719 23,147
Prior service credit (12) (12)
Net actuarial losses 239 236
Income before income taxes 10,350 9,692
Income tax (expense) benefit (2,732) (2,891)
Net income 7,618 6,801
Total reclassified for the period 268 564
Securities Available For Sale and Transferred Securities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassified for the period 407 699
Pension And Post-Retirement Obligations [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassified for the period (139) (135)
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassified for the period 268 564
Reclassification out of Accumulated Other Comprehensive Income [Member] | Realized Gain on Sale of Investment Securities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on disposal of investment securities 613 1,062
Interest income 49 77
Income before income taxes 662 1,139
Income tax (expense) benefit (255) (440)
Net income 407 699
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension And Post-Retirement Obligations [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Prior service credit 12 12
Net actuarial losses (239) (236)
Income before income taxes (227) (224)
Income tax (expense) benefit 88 89
Net income $ (139) $ (135)