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Loans Receivable and Allowance for Loan Losses (Schedule of Troubled Debt Restructurings) (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) SecurityLoan | Sep. 30, 2016 USD ($) SecurityLoan | Sep. 30, 2017 USD ($) SecurityLoan | Sep. 30, 2016 USD ($) SecurityLoan
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Number of Loans | SecurityLoan | 2 | 0 | 9 | 0
Pre-Modification Outstanding Recorded Investment | $ 632 | $ 0 | $ 4,806 | $ 0
Post-Modification Outstanding Recorded Investment | $ 470 | $ 0 | $ 4,480 | $ 0
Mortgage Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Number of Loans | SecurityLoan | 2 | 0 | 7 | 0
Pre-Modification Outstanding Recorded Investment | $ 632 | $ 0 | $ 3,436 | $ 0
Post-Modification Outstanding Recorded Investment | $ 470 | $ 0 | $ 3,202 | $ 0
Mortgage Portfolio Segment [Member] | Residential [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Number of Loans | SecurityLoan | 2 | 0 | 7 | 0
Pre-Modification Outstanding Recorded Investment | $ 632 | $ 0 | $ 3,436 | $ 0
Post-Modification Outstanding Recorded Investment | $ 470 | $ 0 | $ 3,202 | $ 0
Commercial Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Number of Loans | SecurityLoan |  |  | 1 | 0
Pre-Modification Outstanding Recorded Investment |  |  | $ 1,300 | $ 0
Post-Modification Outstanding Recorded Investment |  |  | $ 1,210 | $ 0
Consumer Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Number of Loans | SecurityLoan |  |  | 1 | 0
Pre-Modification Outstanding Recorded Investment |  |  | $ 70 | $ 0
Post-Modification Outstanding Recorded Investment |  |  | $ 68 | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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