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Allowance for Credit Losses - Loans - Loan modifications to borrowers experiencing financial difficulty (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Unfunded loan	$ 0			$ 0
Modified to borrowers which subsequently defaulted	0			0
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	1,002,306,000			1,002,306,000	$ 990,766,000
Maturity date extensions
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	417,000			417,000
Extended Maturity and Interest Rate Reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	7,047,000			7,047,000
Other commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Term extension date		1 year	5 months
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	144,806,000			144,806,000
Other commercial and industrial | Maturity date extensions
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	417,000			$ 417,000
Percentage of Total Class of Loans				0.29%
Other commercial real estate (non-owner occupied)
Financing Receivable, Allowance for Credit Loss [Line Items]
Term extension date		3 months
Deferred interest income, period		7 months
Deferred interest income		$ 303,000
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	229,885,000			$ 229,885,000
Other commercial real estate (non-owner occupied) | Commercial loans secured by Non-Owner Occupied real estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	7,000,000.0			7,000,000.0
Other commercial real estate (non-owner occupied) | Extended Maturity and Interest Rate Reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	$ 7,047,000			$ 7,047,000
Percentage of Total Class of Loans				3.07%

X

- Definition

The amount of interest income deferred until maturity of financing receivable modified for debtor experiencing financial difficulty.

+ References

No definition available.

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- Definition

Period for which interest only payment at a reduced rate, of financing receivable modified for debtor experiencing financial difficulty.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ 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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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
-Paragraph 5
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-Publisher FASB
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- Definition

Accumulated amortized cost excluding accrued interest, of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
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- Definition

Amortized cost excluding accrued interest, of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 44
-Subparagraph (a)(2)
-Publisher FASB
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- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

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- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
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- Definition

Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Name Accounting Standards Codification
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