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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain on investment securities	$ 426	$ 286	$ 2,426	$ 1,348
Interest income	26,050	24,131	75,968	70,682
Prior service credit	(12)	(12)	(36)	(36)
Net actuarial losses	238	237	716	708
Income before income taxes	12,010	11,064	32,403	30,091
Income tax (expense) benefit	(3,541)	(2,748)	(9,165)	(8,389)
Net income	8,469	8,316	23,238	21,702
Total reclassified for the period	127	70	1,125	537
Securities Available For Sale and Transferred Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassified for the period	266	208	1,543	950
Pension And Post-Retirement Obligations [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassified for the period	(139)	(138)	(418)	(413)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassified for the period	127	70	1,125	537
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 investment securities	426	286	2,426	1,348
Interest income	7	52	86	198
Income before income taxes	433	338	2,512	1,546
Income tax (expense) benefit	(167)	(130)	(969)	(596)
Net income	266	208	1,543	950
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	36	36
Net actuarial losses	(238)	(237)	(716)	(708)
Income before income taxes	(226)	(225)	(680)	(672)
Income tax (expense) benefit	87	87	262	259
Net income	$ (139)	$ (138)	$ (418)	$ (413)

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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