Available-for-sale debt securities - Additional Information (Detail) - USD ($) $ in Thousands |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Debt Securities, Available-for-Sale [Abstract] | ||
| Debt securities, available-for-sale, allowance for credit loss | $ 0 | $ 0 |
| Debt securities, available-for-sale, amortized cost, maturity, allocated and single maturity date, after year 5 through 10 | 0 | 0 |
| Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | $ 0 | $ 0 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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