Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	[1]	$ 571,031	$ 568,161	$ 548,185	$ 538,257	$ 568,161	$ 538,257
Other comprehensive income (loss) - before reclassifications		622		685		(3,839)	8,630
Amount reclassified from accumulated other comprehensive income		(50)		(141)		(257)	(1,155)
Other comprehensive income (loss), net of tax		572	(4,668)	544	6,931	(4,096)	7,475
Balance	[1]	578,593	571,031	553,421	548,185	578,593	553,421
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	[1]	7,268	11,936	11,392	4,461	11,936	4,461
Other comprehensive income (loss), net of tax		572	(4,668)	544	6,931
Balance	[1]	7,840	7,268	11,936	11,392	7,840	11,936
Net Unrealized Holding (Gain) Loss on Securities Available for Sale, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		2,725	7,186	7,376	286	7,186	286
Other comprehensive income (loss) - before reclassifications		622		685		(3,839)	8,630
Amount reclassified from accumulated other comprehensive income		0		0		0	(855)
Other comprehensive income (loss), net of tax		622		685		(3,839)	7,775
Balance		3,347	2,725	8,061	7,376	3,347	8,061
Net Change in Overfunded Position in Pension and Postretirement Plans Arising During the Year, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		6,084	6,084	4,840	4,840	6,084	4,840
Other comprehensive income (loss) - before reclassifications		0		0		0	0
Amount reclassified from accumulated other comprehensive income		0		0		0	0
Other comprehensive income (loss), net of tax		0		0		0	0
Balance		6,084	6,084	4,840	4,840	6,084	4,840
Net Change in Net Actuarial (Gain) Loss and Prior Service Credit on Pension and Postretirement Benefit Plans, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		(1,541)	(1,334)	(824)	(665)	(1,334)	(665)
Other comprehensive income (loss) - before reclassifications		0		0		0	0
Amount reclassified from accumulated other comprehensive income		(50)		(141)		(257)	(300)
Other comprehensive income (loss), net of tax		(50)		(141)		(257)	(300)
Balance		$ (1,591)	$ (1,541)	$ (965)	$ (824)	$ (1,591)	$ (965)

[1] All periods presented have been adjusted for the 1 for 5 reverse stock split which occurred on May 28, 2021.