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Allowance for Credit Losses - Loans - Loan modifications to borrowers experiencing financial difficulty (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Unfunded loan commitments	$ 0	$ 0
Modified to borrowers which subsequently defaulted	0	0
Total	1,025,687		$ 1,038,271
Current period gross charge-offs, Total	164	139
Maturity date extensions
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	185	$ 439
Extended Maturity and Interest Rate Reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	$ 171
Commercial real estate (owner occupied)
Financing Receivable, Allowance for Credit Loss [Line Items]
Term extension date	5 years
Commercial real estate (owner occupied) | Maturity date extensions
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	$ 185
Percentage of Total Class of Loans	0.21%
Other commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Term extension date	9 months	5 months
Total	$ 148,805		159,424
Current period gross charge-offs, Total	103
Other commercial and industrial | Maturity date extensions
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis		$ 439
Percentage of Total Class of Loans		0.29%
Other commercial and industrial | Extended Maturity and Interest Rate Reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	$ 171
Percentage of Total Class of Loans	0.11%
Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 176,991		174,670
Other commercial real estate (non-owner occupied)
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 229,574		$ 240,286

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The amount of financing receivable excluding accrued interest relating unfunded loan.

+ References

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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

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-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
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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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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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- Definition

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

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

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-Topic 310
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Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

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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.

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