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Loans Receivable and Allowance for Credit Losses (Schedule of Trouble Debt Restructuring Subsequently Defaulted) (Detail) $ in Thousands | 9 Months Ended
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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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- 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 + Details
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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 + Details
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