Investment Securities - Debt Securities, Held-to-Maturity, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023
Allowance for credit losses:
Beginning balance	$ 434	$ 0
Credit loss (reduction) expense	(210)	(6)
Securities charged-off	0	0
Recoveries	0	0
Total ending allowance balance	224	432
Credit loss (reduction) expense	(210)	(6)
Impact of adopting ASC 326
Allowance for credit losses:
Beginning balance		438
State and political subdivisions
Allowance for credit losses:
Beginning balance	222	0
Credit loss (reduction) expense	(84)	(17)
Securities charged-off	0	0
Recoveries	0	0
Total ending allowance balance	138	212
Credit loss (reduction) expense	(84)	(17)
State and political subdivisions \| Impact of adopting ASC 326
Allowance for credit losses:
Beginning balance		229
Corporate securities
Allowance for credit losses:
Beginning balance	212	0
Credit loss (reduction) expense	(126)	11
Securities charged-off	0	0
Recoveries	0	0
Total ending allowance balance	86	220
Credit loss (reduction) expense	$ (126)	11
Corporate securities \| Impact of adopting ASC 326
Allowance for credit losses:
Beginning balance		$ 209

Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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

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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.

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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

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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

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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

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