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Investment Securities - Debt Securities, Held-to-Maturity, Allowance for Credit Loss (Details)	9 Months Ended
	Sep. 30, 2023 USD ($)
Allowance for credit losses:
Beginning balance	$ 0
Credit loss expense (reduction)	(6,000)
Securities charged-off	0
Recoveries	0
Total ending allowance balance	432,000	[1]
Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning balance	438,000
State and political subdivisions
Allowance for credit losses:
Beginning balance	0
Credit loss expense (reduction)	(17,000)
Securities charged-off	0
Recoveries	0
Total ending allowance balance	212,000
State and political subdivisions | Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning balance	229,000
Corporate securities
Allowance for credit losses:
Beginning balance	0
Credit loss expense (reduction)	11,000
Securities charged-off	0
Recoveries	0
Total ending allowance balance	220,000
Corporate securities | Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning balance	$ 209,000
[1] December 31, 2022 and September 30, 2022 had no allowance for credit losses

X

- 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

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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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