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Loans Receivable and Allowance for Credit Losses (Schedule of Trouble Debt Restructuring Subsequently Defaulted) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) SecurityLoan	Sep. 30, 2019 USD ($) SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | SecurityLoan	0	1
Outstanding Recorded Investment | $	$ 0	$ 578
Mortgage Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | SecurityLoan	0	1
Outstanding Recorded Investment | $	$ 0	$ 578
Mortgage Portfolio | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | SecurityLoan	0	1
Outstanding Recorded Investment | $	$ 0	$ 578

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+ References

No definition available.

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- Definition

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

+ References

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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