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Borrowings - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Pledged loans receivable, carrying value | $ 2,170,000,000 |  |
Total borrowing capacity available from the collateral | 1,730,000,000 |  |
Available borrowing capacity | 1,440,000,000 |  |
Available for use through the Federal Reserve Bank of San Francisco Discount Window | 26,300,000 |  |
Pledged loans, carrying values | 27,300,000 |  |
Borrowings | 0 |  |
Advances from the FHLB | 150,000,000.0 | $ 90,000,000.0 |
Increase in the advances from the FHLB | 60,000,000.0 |  |
Interest expense on FHLB | $ 2,200,000 | $ 763,000 | $ 3,400,000
Weighted-average interest rates | 1.42% | 1.89% | 1.94%
Payment Protection Program |  |  |
Debt Instrument [Line Items] |  |  |
Borrowings | $ 0 |  |
Available borrowing capacity | $ 300,400,000 |  |
Maturity date | Mar. 31, 2021 |  |

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- Definition Available borrowing capacity. + References No definition available. + Details
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- Definition Available Borrowing From Federal Reserve Discount Window + References No definition available. + Details
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- Definition Borrowing. + References No definition available. + Details
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- Definition Borrowing capacity available based on pledged collateral. + References No definition available. + Details
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- Definition Borrowing capacity based on pledged collateral. + References No definition available. + Details
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- Definition Carrying Value Of Loans Pledged As Collateral For FHLB Advances + References No definition available. + Details
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- Definition Amount of interest expense on loans received from Federal Home Loan Bank (FHLB). + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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