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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain on disposal of investment securities   $ 949 $ 1,062 $ 1,262
Interest income $ 23,404 23,103 46,551 46,378
Prior service credit     (24) (24)
Net actuarial losses     471 88
Income before income taxes 9,335 10,114 19,027 20,427
Income tax (expense) benefit (2,750) (3,082) (5,641) (6,176)
Net income $ 6,585 $ 7,032 13,386 14,251
Total reclassified for the period     467 880
Securities Available For Sale and Transferred Securities [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassified for the period     742 919
Pension And Post-Retirement Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassified for the period     (275) (39)
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassified for the period     467 880
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     1,062 1,262
Interest income     146 259
Income before income taxes     1,208 1,521
Income tax (expense) benefit     (466) (602)
Net income     742 919
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]     24 24
Net actuarial losses [1]     (471) (88)
Income before income taxes     (447) (64)
Income tax (expense) benefit     172 25
Net income     $ (275) $ (39)
[1] These items are included in the computation of net periodic pension expense. See Note 11 - Employee Benefit Plans for additional information.