Goodwill and Other Intangible Assets (Amortization Schedule for Intangible Assets) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Apr. 30, 2018	Nov. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 16,000	$ 19,000	$ 49,000	$ 57,000
FNBPA Bancorp, Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning Balance at Acquisition Date								$ 303,000
Amortization of intangible assets	6,000		20,000
FNBPA Bancorp, Inc [Member] | Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning Balance at Acquisition Date								$ 303,000
Amortization of intangible assets			20,000		$ 33,000	$ 190,000
Unamortized balance	60,000		60,000		80,000
Scheduled remaining amortization expense for years ended:
December 31, 2021	7,000		7,000
December 31, 2022	22,000		22,000
December 31, 2023	16,000		16,000
December 31, 2024	10,000		10,000
December 31, 2025	5,000		5,000
Liverpool Community Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning Balance at Acquisition Date							$ 289,000
Amortization of intangible assets	10,000		29,000
Liverpool Community Bank [Member] | Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning Balance at Acquisition Date							$ 289,000
Amortization of intangible assets			29,000		44,000	$ 84,000
Unamortized balance	132,000		132,000		$ 161,000
Scheduled remaining amortization expense for years ended:
December 31, 2021	10,000		10,000
December 31, 2022	33,000		33,000
December 31, 2023	28,000		28,000
December 31, 2024	23,000		23,000
December 31, 2025	17,000		17,000
December 31, 2026	$ 21,000		$ 21,000