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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
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 487,126	$ 466,284	$ 468,363	$ 448,045	$ 439,393	$ 438,947	$ 468,363	$ 438,947
Other comprehensive income (loss) before reclassifications	6,351			401			(14,735)	14,506
Amounts reclassified from accumulated other comprehensive income (loss)	169			(114)			491	(202)
Other comprehensive income (loss), net of tax	(6,182)	4,638	(12,700)	287	1,586	12,431	(14,244)	14,304
Balance	494,013	487,126	466,284	456,361	448,045	439,393	494,013	456,361
Hedging Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	747		(316)	(815)		(518)	(316)	(518)
Other comprehensive income (loss) before reclassifications	(80)			123			1,143	(174)
Other comprehensive income (loss), net of tax	(80)			123			1,143	(174)
Balance	827	747		(692)	(815)		827	(692)
Securities Available-For-Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	5,343		14,743	14,720		873	14,743	873
Other comprehensive income (loss) before reclassifications	6,431			278			(15,878)	14,680
Amounts reclassified from accumulated other comprehensive income (loss)	31			(347)			78	(902)
Other comprehensive income (loss), net of tax	6,400			(69)			(15,800)	13,778
Balance	1,057	5,343		14,651	14,720		1,057	14,651
Pension And Post-Retirement Obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(12,024)		(12,299)	(14,401)		(14,868)	(12,299)	(14,868)
Amounts reclassified from accumulated other comprehensive income (loss)	138			233			413	700
Other comprehensive income (loss), net of tax	138			233			413	700
Balance	(11,886)	(12,024)		(14,168)	(14,401)		(11,886)	(14,168)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(5,934)	(10,572)	2,128	(496)	(2,082)	(14,513)	2,128	(14,513)
Other comprehensive income (loss), net of tax	(6,182)	4,638	(12,700)	287	1,586	12,431
Balance	$ (12,116)	$ (5,934)	$ (10,572)	$ (209)	$ (496)	$ (2,082)	$ (12,116)	$ (209)

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