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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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain on disposal of investment securities	$ 1,387		$ 2,000	$ 1,062
Interest income	25,199	$ 23,404	49,918	46,551
Prior service credit	(12)	(12)	(24)	(24)
Net actuarial losses	239	235	478	471
Income before income taxes	10,043	9,335	20,393	19,027
Income tax (expense) benefit	(2,892)	(2,750)	(5,624)	(5,641)
Net income	7,151	6,585	14,769	13,386
Total reclassified for the period	730	(97)	998	467
Securities Available For Sale and Transferred Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassified for the period	870	43	1,277	742
Pension And Post-Retirement Obligations [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassified for the period	(140)	(140)	(279)	(275)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassified for the period	730	(97)	998	467
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	1,387		2,000	1,062
Interest income	30	69	79	146
Income before income taxes	1,417	69	2,079	1,208
Income tax (expense) benefit	(547)	(26)	(802)	(466)
Net income	870	43	1,277	742
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	24	24
Net actuarial losses	(239)	(235)	(478)	(471)
Income before income taxes	(227)	(223)	(454)	(447)
Income tax (expense) benefit	87	83	175	172
Net income	$ (140)	$ (140)	$ (279)	$ (275)

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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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