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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Beginning Balance | $ 85,000 | $ 100,000 | $ 89,000 | $ 37,000
Provision (Recovery) | 9,000 | (12,000) | 5,000 | 51,000
Ending Balance | 94,000 | 88,000 | 94,000 | 88,000
Municipal |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Beginning Balance | 2,000 | 2,000 | 2,000 | 2,000
Provision (Recovery) | (1,000) |  | (1,000) |
Ending Balance | 1,000 | 2,000 | 1,000 | 2,000
Corporate bonds and other securities |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |
Beginning Balance | 83,000 | 98,000 | 87,000 | 35,000
Provision (Recovery) | 10,000 | (12,000) | 6,000 | 51,000
Ending Balance | $ 93,000 | $ 86,000 | $ 93,000 | $ 86,000

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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
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