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Loans and Leases Receivable and Allowance for Credit Losses - Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 USD ($) Loan | Dec. 31, 2018 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of TDR loans that defaulted on payments | Loan | 24 | 4 | 4
Recorded investment | $ | $ 614 | $ 154 | $ 92
Installment |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of TDR loans that defaulted on payments | Loan | 15 | 0 | 0
Recorded investment | $ | $ 226 | $ 0 | $ 0
Residential real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of TDR loans that defaulted on payments | Loan | 3 | 1 | 0
Recorded investment | $ | $ 152 | $ 81 | $ 0
Manufactured housing |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of TDR loans that defaulted on payments | Loan | 6 | 3 | 4
Recorded investment | $ | $ 236 | $ 73 | $ 92

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- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524 + Details
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