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Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
	Jan. 01, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 396,293	$ 422,354	$ 408,253	$ 396,293	$ 386,937	$ 380,302	$ 381,177	$ 396,293	$ 381,177
Other comprehensive income (loss) before reclassifications		2,280			(1,808)			12,563	(10,570)
Reclassification from AOCI to retained earnings	2,800
Amounts reclassified from accumulated other comprehensive income (loss)		(854)			284			(233)	666
Total other comprehensive income (loss), net of tax		1,426	5,394	5,510	(1,524)	(2,133)	(6,247)	12,330	(9,904)
Balance		432,617	422,354	408,253	392,154	386,937	380,302	432,617	392,154
Hedging Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(276)	(636)		(276)	123			(276)
Other comprehensive income (loss) before reclassifications		43			85			(317)	208
Total other comprehensive income (loss), net of tax		43			85			(317)	208
Balance		(593)	(636)		208	123		(593)	208
Securities Available-For-Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(7,769)	2,292		(7,769)	(12,032)		(3,275)	(7,769)	(3,275)
Other comprehensive income (loss) before reclassifications		2,237			(1,893)			12,880	(10,778)
Reclassification from AOCI to retained earnings								(681)
Amounts reclassified from accumulated other comprehensive income (loss)		(1,116)			157			(1,017)	285
Total other comprehensive income (loss), net of tax		1,121			(1,736)			11,863	(10,493)
Balance		3,413	2,292		(13,768)	(12,032)		3,413	(13,768)
Pension And Post-Retirement Obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(13,236)	(14,816)		(13,236)	(8,387)		(8,641)	(13,236)	(8,641)
Reclassification from AOCI to retained earnings								(2,102)
Amounts reclassified from accumulated other comprehensive income (loss)		262			127			784	381
Total other comprehensive income (loss), net of tax		262			127			784	381
Balance		(14,554)	(14,816)		(8,260)	(8,387)		(14,554)	(8,260)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ (21,281)	(13,160)	(18,554)	(21,281)	(20,296)	(18,163)	(11,916)	(21,281)	(11,916)
Reclassification from AOCI to retained earnings								(2,783)
Total other comprehensive income (loss), net of tax		1,426	5,394	5,510	(1,524)	(2,133)	(6,247)	12,330	(9,904)
Balance		$ (11,734)	$ (13,160)	$ (18,554)	$ (21,820)	$ (20,296)	$ (18,163)	$ (11,734)	$ (21,820)

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

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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