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Loans Receivable and Allowance for Loan Losses - Summary of Loans and Leases Modified in Troubled Debt Restructurings and Recorded Investments (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
Commercial and industrial (including owner occupied commercial real estate) |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 4 | 1 | 3
Recorded Investment | $ | $ 6,437 | $ 76 | $ 791
Commercial real estate - non-owner occupied |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 0 | 1 | 1
Recorded Investment | $ | $ 0 | $ 1,844 | $ 211
Manufactured housing |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 36 | 58 | 156
Recorded Investment | $ | $ 1,634 | $ 2,286 | $ 6,251
Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 0 | 4 | 2
Recorded Investment | $ | $ 0 | $ 2,410 | $ 204

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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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