Guarantees, Commitments, and Contingencies (Narrative) (Details)		6 Months Ended	12 Months Ended	18 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) Apartment	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment		37
Limited partner capital contribution	$ 7,506,000	$ 7,506,000		$ 7,506,000
Project investment amortization period		10 years
PPP Loans [Member] | Small Business Administration [Member]
Commitments, Contingencies and Guarantees [Line Items]
Nonrefundable loan processing fees received	17,997,000	$ 17,997,000	$ 20,883,000	38,880,000
Cumberland County, Pennsylvania
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment		39
Limited partner capital contribution	10,805,000	$ 10,805,000		10,805,000
Total LIHTCs amount awarded for the project		1,205,000
Total anticipated LIHTCs amount under the housing project	$ 12,046,000	$ 12,046,000		$ 12,046,000
Project investment amortization period		10 years
Financial Standby Letters of Credit [Member]
Commitments, Contingencies and Guarantees [Line Items]
Commitments to extend credit		$ 44,249,000	$ 39,468,000