Loans Receivable and Allowance for Credit Losses (Schedule of Trouble Debt Restructuring Subsequently Defaulted) (Details)	3 Months Ended
Mar. 31, 2021 SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of payment defaults for loans modified as TDRs	0

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration