Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 446,846	$ 505,142	$ 466,284	$ 468,363	$ 505,142	$ 468,363
Total other comprehensive (loss) income, net of tax	(32,631)	(53,887)	4,638	(12,700)	(86,518)	(8,062)
Balance	425,801	446,846	487,126	466,284	425,801	487,126
Hedging Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	2,998	1,160	1,248	(316)	1,160	(316)
Other comprehensive income (loss) before reclassifications	737		(501)		2,575	1,063
Total other comprehensive (loss) income, net of tax	737		(501)		2,575	1,063
Balance	3,735	2,998	747	1,248	3,735	747
Securities Available-For-Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(60,744)	(4,971)	341	14,743	(4,971)	14,743
Other comprehensive income (loss) before reclassifications	(33,446)		4,954		(89,242)	(9,447)
Reclassification, Net of tax amount	31		48		54	47
Total other comprehensive (loss) income, net of tax	(33,415)		5,002		(89,188)	(9,400)
Balance	(94,159)	(60,744)	5,343	341	(94,159)	5,343
Pension And Post-Retirement Obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9,348)	(9,396)	(12,161)	(12,299)	(9,396)	(12,299)
Reclassification, Net of tax amount	47		137		95	275
Total other comprehensive (loss) income, net of tax	47		137		95	275
Balance	9,301	(9,348)	(12,024)	(12,161)	9,301	(12,024)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(67,094)	(13,207)	(10,572)	2,128	(13,207)	2,128
Other comprehensive income (loss) before reclassifications	(32,709)		4,453		(86,667)	(8,384)
Reclassification, Net of tax amount	78		185		149	322
Total other comprehensive (loss) income, net of tax	(32,631)	(53,887)	4,638	(12,700)	(86,518)	(8,062)
Balance	$ (99,725)	$ (67,094)	$ (5,934)	$ (10,572)	$ (99,725)	$ (5,934)