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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain on disposal of investment securities $ 286 $ 515 $ 1,348 $ 1,777
Interest income 24,131 23,258 70,682 69,636
Prior service credit     (36) (36)
Net actuarial losses     708 132
Income before income taxes 11,064 10,549 30,091 30,976
Income tax (expense) benefit (2,748) (3,365) (8,389) (9,541)
Net income $ 8,316 $ 7,184 21,702 21,435
Total reclassified for the period     537 1,251
Securities Available For Sale and Transferred Securities [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassified for the period     950 1,309
Pension And Post-Retirement Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassified for the period     (413) (58)
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassified for the period     537 1,251
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     1,348 1,777
Interest income     198 390
Income before income taxes     1,546 2,167
Income tax (expense) benefit     (596) (858)
Net income     950 1,309
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension And Post-Retirement Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Prior service credit [1]     36 36
Net actuarial losses [1]     (708) (132)
Income before income taxes     (672) (96)
Income tax (expense) benefit     259 38
Net income     $ (413) $ (58)
[1] These items are included in the computation of net periodic pension expense. See Note 11 - Employee Benefit Plans for additional information.