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Investment Securities - Allowance for credit losses of available for sale securities by major security type (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 1,000,000 | $ 360,000 | $ 360,000 | $ 926,000
Charge-Offs | (1,000,000) |  | (1,000,000) | (491,000)
Provision (Recovery) | 0 | 0 | 640,000 | (75,000)
Ending Balance | 0 | 360,000 | 0 | 360,000
Corporate bonds |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 1,000,000 | 360,000 | 360,000 | 926,000
Charge-Offs | (1,000,000) |  | (1,000,000) | (491,000)
Provision (Recovery) | $ 0 | 0 | $ 640,000 | (75,000)
Ending Balance |  | $ 360,000 |  | $ 360,000

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- Definition Amount, excluding accrued interest, of credit loss expense and net of reversal of credit loss expense on investment in debt securities available-for-sale. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount excluding accrued interest, 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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Period Type: | instant

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- Definition Amount, excluding accrued interest, of decrease in 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) from writeoff. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Details
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