Allowance for Credit Losses (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Allowance for Credit Losses [Abstract]
Financing receivables on non-accrual status	$ 0	$ 0
Allowance for credit losses	$ 0	$ 0

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant