Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	$ (64,669,000)		$ 14,108,000		$ 10,975,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(66,892,000)		34,059,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2,377,000		(29,006,000)
Other Comprehensive Income (Loss), before Tax	(64,515,000)		5,053,000
Other Comprehensive Income (Loss), Tax	16,126,000		(1,920,000)
Other comprehensive income (loss)	(48,389,000)		3,133,000		(21,495,000)
Reclassification Where Impairment Was Not Previously Recognized	0		0
Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	(23,107,000)	[1]	(19,629,000)	[1]	(19,328,000)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(1,110,000)		(2,527,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,996,000		2,042,000
Other Comprehensive Income (Loss), before Tax	886,000		(485,000)
Other Comprehensive Income (Loss), Tax	(222,000)		184,000
Other comprehensive income (loss)	664,000		(301,000)
Reclassification Where Impairment Was Not Previously Recognized	0		0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	6,855,000		0		0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	8,381,000		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	760,000		0
Other Comprehensive Income (Loss), before Tax	9,141,000		0
Other Comprehensive Income (Loss), Tax	(2,286,000)		0
Other comprehensive income (loss)	6,855,000		0
Reclassification Where Impairment Was Not Previously Recognized	0		0
Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	(52,278,000)	[2]	30,326,000	[2]	27,328,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(73,725,000)		36,307,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(447,000)		(31,433,000)
Other Comprehensive Income (Loss), before Tax	(74,172,000)		4,874,000
Other Comprehensive Income (Loss), Tax	18,541,000		(1,852,000)
Other comprehensive income (loss)	(55,631,000)		3,022,000
Reclassification Where Impairment Was Not Previously Recognized	(12,000)		(24,000)
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	3,861,000	[2]	3,411,000	[2]	$ 2,975,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(438,000)		279,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	68,000		385,000
Other Comprehensive Income (Loss), before Tax	(370,000)		664,000
Other Comprehensive Income (Loss), Tax	93,000		(252,000)
Other comprehensive income (loss)	(277,000)		412,000
Reclassification Where Impairment Was Not Previously Recognized	12,000		$ 24,000
Accounting Standards Update 2018-02 Member [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	2,932,000
Accounting Standards Update 2018-02 Member [Member] | Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(4,142,000)
Accounting Standards Update 2018-02 Member [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0
Accounting Standards Update 2018-02 Member [Member] | Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	6,359,000
Accounting Standards Update 2018-02 Member [Member] | Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	715,000
Accounting Standards Update 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(33,320,000)
Accounting Standards Update 2016-01 [Member] | Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0
Accounting Standards Update 2016-01 [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0
Accounting Standards Update 2016-01 [Member] | Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(33,320,000)
Accounting Standards Update 2016-01 [Member] | Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 0

[1] (2) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "interest and fees on loans" in the consolidated statements of income. The requirement to revalue deferred tax assets and liabilities in the period of enactment stranded the effects of the tax rate change, mandated by the Tax Cuts and Jobs Act, in accumulated other comprehensive income. In response, the FASB issued ASU 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income", which the Company adopted on January 1, 2018. This ASU allowed the reclassification of the stranded tax effects from accumulated other comprehensive income (loss) (as shown in the table above) to retained earnings.As mentioned in Note 1, new accounting guidance for investment securities, which was effective January 1, 2018, required the reclassification of unrealized gains on equity securities from accumulated other comprehensive income (loss) to retained earnings (also shown above).

[2] The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income.