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Loans Receivable and Allowance for Loan Losses - Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 USD ($) Loan | Sep. 30, 2017 USD ($) Loan | Sep. 30, 2018 USD ($) Loan | Sep. 30, 2017 USD ($) Loan
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loan | 8 | 4 | 33 | 36
Recorded Investment | $ | $ 473 | $ 182 | $ 1,458 | $ 7,560
Commercial and industrial (including owner occupied commercial real estate) |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loan |  |  | 0 | 3
Recorded Investment | $ |  |  | $ 0 | $ 6,203
Manufactured housing |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loan | 7 | 4 | 30 | 33
Recorded Investment | $ | $ 321 | $ 182 | $ 1,093 | $ 1,357
Residential real estate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loan | 1 | 0 | 2 | 0
Recorded Investment | $ | $ 152 | $ 0 | $ 352 | $ 0
Other |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | Loan |  |  | 1 | 0
Recorded Investment | $ |  |  | $ 13 | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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