Loans - Schedule of Payments in Arrears Past Due Financing Receivables (Parenthetical) (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) Loan		Dec. 31, 2020 USD ($) Loan
Financing Receivable Recorded Investment Past Due [Line Items]
Payment for non performing loan interest	$ 300,000		$ 849,000
Current [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Number of loans | Loan	1
Principal	$ 7,994,000
Arrears on real estate of non performing secured loans extended date	2021-10
Payment for non performing loan interest	$ 56,000
Arrears on real estate of non performing secured loans maturity date	2022-03
Past Due 90 Days Or More [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Foregone interest	$ 228,000		$ 512,000
Interest, Due Date	Oct. 01, 2021		Jan. 01, 2021
Number of loans | Loan	4	[1]	3	[2]
Principal	$ 6,598,000	[1]	$ 15,988,000	[2]
Past Due 90 Days Or More [Member] | Forbearance Agreement [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Number of loans | Loan	1		2
Principal	$ 5,380,000		$ 10,735,000

[1] One loan, with principal of approximately $5,380,000, included in past maturity payments (principal and interest) 180 or more days, had forbearance agreements in place at September 30, 2021.

[2] Two loans, with an aggregate principal of approximately $10,735,000, included in past maturity payments (principal and interest) 180 or more days, had forbearance agreements in place at December 31, 2020.