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Securities & Allowance for Securities Credit Losses - Schedule of Amortized Cost of HTM Debt Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning period | $ 144 | $ 248 | $ 202 | $ 348
Provision for (recapture of) credit losses | (11) | 13 | (69) | (87)
Write offs charged against the allowance | 0 | 0 | 0 | 0
Recoveries of amounts previously written off | 0 | 0 | 0 | 0
Ending period | 133 | 261 | 133 | 261
U.S. government and federal agencies |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning period | 0 | 0 | 0 | 0
Provision for (recapture of) credit losses | 0 | 0 | 0 | 0
Write offs charged against the allowance | 0 | 0 | 0 | 0
Recoveries of amounts previously written off | 0 | 0 | 0 | 0
Ending period | 0 | 0 | 0 | 0
Mortgage Backed Securities |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning period | 0 | 0 | 0 | 0
Provision for (recapture of) credit losses | 0 | 0 | 0 | 0
Write offs charged against the allowance | 0 | 0 | 0 | 0
Recoveries of amounts previously written off | 0 | 0 | 0 | 0
Ending period | 0 | 0 | 0 | 0
Corporate bonds |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning period | 114 | 215 | 171 | 322
Provision for (recapture of) credit losses | (10) | 15 | (67) | (92)
Write offs charged against the allowance | 0 | 0 | 0 | 0
Recoveries of amounts previously written off | 0 | 0 | 0 | 0
Ending period | 104 | 230 | 104 | 230
State and municipal securities |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning period | 30 | 33 | 31 | 26
Provision for (recapture of) credit losses | (1) | (2) | (2) | 5
Write offs charged against the allowance | 0 | 0 | 0 | 0
Recoveries of amounts previously written off | 0 | 0 | 0 | 0
Ending period | $ 29 | $ 31 | $ 29 | $ 31

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