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Loans Receivable and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) SecurityLoan | Dec. 31, 2016 USD ($) SecurityLoan
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan | 8 | 1
Pre-Modification Outstanding Recorded Investment | $ 3,604 | $ 1,300
Post-Modification Outstanding Recorded Investment | $ 3,391 | $ 1,300
Mortgage Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan | 5 |
Pre-Modification Outstanding Recorded Investment | $ 2,468 |
Post-Modification Outstanding Recorded Investment | $ 2,260 |
Mortgage Portfolio Segment [Member] | Residential [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan | 5 |
Pre-Modification Outstanding Recorded Investment | $ 2,468 |
Post-Modification Outstanding Recorded Investment | $ 2,260 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ 874 | $ 1,300
Post-Modification Outstanding Recorded Investment | $ 874 | $ 1,300
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan | 2 |
Pre-Modification Outstanding Recorded Investment | $ 262 |
Post-Modification Outstanding Recorded Investment | $ 257 |

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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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- Definition Pre-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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