Guarantees, Commitments, and Contingencies (Narrative) (Details)		3 Months Ended	6 Months Ended	12 Months Ended		27 Months Ended
	Nov. 30, 2021 USD ($) Apartment Building Shop	Mar. 31, 2022 USD ($) Apartment	Jun. 30, 2021 USD ($) Apartment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2022 USD ($)
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment		37
Limited partner capital contribution		$ 7,506,000				$ 7,506,000
Total LIHTCs amount awarded for the project				$ 8,530,000
Project investment amortization period		10 years
Limited partner capital contribution commitment		$ 7,506,000				7,506,000
Total LIHTCs amount awarded for the project				8,530,000
PPP Loans [Member] | Small Business Administration [Member]
Commitments, Contingencies and Guarantees [Line Items]
Nonrefundable loan processing fees received		2,989,000		17,997,000	$ 20,883,000	$ 41,869,000
Cumberland County, Pennsylvania
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment			39
Limited partner capital contribution			$ 10,805,000
Total LIHTCs amount awarded for the project			1,205,000
Total anticipated LIHTCs amount under the housing project			$ 12,046,000
Project investment amortization period			10 years
Limited partner capital contribution commitment			$ 10,805,000
Total LIHTCs amount awarded for the project			$ 1,205,000
Riverview [Member]
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment	17
Limited partner capital contribution	$ 4,356,000
Total LIHTCs amount awarded for the project	484,000
Total anticipated LIHTCs amount under the housing project	$ 4,840,000
Project investment amortization period	10 years
Number Of Buildings | Building	3
Number of shops under the project | Shop	2
Limited partner capital contribution commitment	$ 4,356,000
Total LIHTCs amount awarded for the project	484,000
Principal amount of construction loan	$ 3,500,000
Interest percentage	5.50%
Term of construction loan	24 months
Financial Standby Letters of Credit [Member]
Commitments, Contingencies and Guarantees [Line Items]
Commitments to extend credit		$ 47,841,000		$ 55,609,000