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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 | 12 Months Ended
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Dec. 31, 2017 USD ($) Loan | Dec. 31, 2016 USD ($) Loan | Dec. 31, 2015 USD ($) Loan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 40 | 64 | 162
Recorded Investment | $ | $ 8,071 | $ 6,616 | $ 7,457
Extensions of maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 5 | 3 | 1
Recorded Investment | $ | $ 6,497 | $ 1,995 | $ 183
Interest-rate reductions |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 35 | 61 | 161
Recorded Investment | $ | $ 1,574 | $ 4,621 | $ 7,274

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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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