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Investment Securities - Allowance for credit losses of held to maturity securities by major security type (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Beginning Balance | $ 100,000 | $ 109,000 | $ 37,000 |
Provision (Recovery) | (12,000) | (77,000) | 51,000 | $ (82,000)
Ending Balance | 88,000 | 32,000 | 88,000 | 32,000
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Beginning Balance |  |  |  | 114,000
U.S. Agency |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Ending Balance | 0 |  | 0 |
U.S. Agency mortgage-backed securities |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Ending Balance | 0 |  | 0 |
Municipal |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Beginning Balance | 2,000 | 2,000 | 2,000 |
Provision (Recovery) |  |  |  | (1,000)
Ending Balance | 2,000 | 2,000 | 2,000 | 2,000
Municipal | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Beginning Balance |  |  |  | 3,000
Corporate bonds and other securities |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Beginning Balance | 98,000 | 107,000 | 35,000 |
Provision (Recovery) | (12,000) | (77,000) | 51,000 | (81,000)
Ending Balance | $ 86,000 | $ 30,000 | $ 86,000 | 30,000
Corporate bonds and other securities | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Beginning Balance |  |  |  | $ 111,000

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- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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