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Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified Out Of Each Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain on disposal of investment securities |  | $ 1,988 | $ 2,041 | $ 1,226
Interest income |  | 95,313 | 93,774 | 91,594
Prior service credit |  | 895 | 128 | 1,316
Net actuarial losses |  | (887) | (9,709) | 11,860
Income before income taxes |  | 38,876 | 38,980 | 37,907
Income tax (expense) benefit |  | (10,539) | (9,625) | (12,377)
Net income |  | 28,337 | 29,355 | 25,530
Total reclassified for the period |  | 833 | 1,420 | (11)
Securities Available For Sale and Transferred Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassified for the period |  | 1,383 | 1,497 | 784
Pension And Post-Retirement Items [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassified for the period |  | (550) | (77) | $ (795)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassified for the period |  | 833 | 1,420 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Securities Available For Sale and Transferred Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain on disposal of investment securities |  | 1,988 | 2,041 |
Interest income |  | 263 | 437 |
Income before income taxes |  | (2,251) | (2,478) |
Income tax (expense) benefit |  | (868) | (981) |
Net income |  | (1,383) | (1,497) |
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] | 48 | 48 |
Net actuarial losses | [1] | (943) | (176) |
Income before income taxes |  | 895 | 128 |
Income tax (expense) benefit |  | 345 | 51 |
Net income |  | $ 550 | $ 77 |
[1] | These items are included in the computation of net periodic pension expense. See Note 17 - Employee Benefit Plans for additional information.

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