Other Identifiable Intangible Assets (Narrative) (Details) - USD ($)	1 Months Ended		3 Months Ended
	Jan. 31, 2020	May 31, 2016	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization			$ 2,143,000		$ 2,044,000
Amortization of intangible assets			99,000	$ 99,000
Goodwill			263,000		263,000
McMahon Leasing [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 263,000
Payments for purchase of business	8,700,000
Acquired finite-lived intangible assets	1,100,000
Customer List Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition purchase price		$ 60,000,000.0
Finite-Lived Intangible Assets, Remaining Amortization Period		10 years
Amortization of intangible assets over five years			1,400,000
Gross intangible assets		$ 3,400,000
Accumulated amortization			2,143,000		2,044,000
Amortization of intangible assets			340,000
Gross Carrying Amount			4,093,000		4,093,000
Customer List Intangibles [Member] | Lease Receivable Purchased [Member]
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets			3,400,000		3,400,000
Accumulated amortization			$ 2,000,000.0		$ 1,900,000
Customer List Intangibles [Member] | McMahon Leasing [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			12 years
Accumulated amortization			$ 129,000
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year			57,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months			57,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two			57,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three			57,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four			57,000
Finite-Lived Intangible Assets, Net			$ 287,000
Gross Carrying Amount	689,000
Trade Names [Member] | McMahon Leasing [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	$ 135,000