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Loans Receivable and Allowance for Loan Losses - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) Loan | Mar. 31, 2017 USD ($) Loan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loan | 9 | 21
Recorded Investment | $ | $ 322 | $ 1,203
Extensions of maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loan | 0 | 1
Recorded Investment | $ | $ 0 | $ 348
Interest-rate reductions |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loan | 9 | 20
Recorded Investment | $ | $ 322 | $ 855

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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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