Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Allowance for credit losses
Balance at Beginning of Period	$ 5,000	$ 5,000
Balance at End of Period	$ 5,000	5,000	$ 5,000
Cumulative Effect of Adoption Adjustment \| ASU 2016-13
Allowance for credit losses
Balance at Beginning of Period		$ 5,000	5,000
Balance at End of Period			$ 5,000

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant