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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) Loan | Jun. 30, 2017 USD ($) Loan | Jun. 30, 2018 USD ($) Loan | Jun. 30, 2017 USD ($) Loan
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loan | 16 | 11 | 25 | 32
Recorded Investment | $ | $ 663 | $ 6,175 | $ 985 | $ 7,378
Extensions of maturity |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loan | 1 | 2 | 1 | 3
Recorded Investment | $ | $ 56 | $ 5,855 | $ 56 | $ 6,203
Interest-rate reductions |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loan | 15 | 9 | 24 | 29
Recorded Investment | $ | $ 607 | $ 320 | $ 929 | $ 1,175

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