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Financial Derivative Instruments (Details)	Mar. 31, 2024 USD ($) derivative	Dec. 31, 2023 USD ($) derivative	Mar. 31, 2023 USD ($) derivative
Customer loan interest swap agreements
Derivative [Line Items]
Collateral posted	$ 0
Designated as Hedging Instrument | Interest rate swap agreements
Derivative [Line Items]
Notional Amount	235,000,000	$ 245,000,000	$ 205,000,000
Fair Value	$ 618,000	(1,769,000)	(2,774,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap October 27 2023
Derivative [Line Items]
Fixed Rate Paid	2.498%
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap January 27 2024
Derivative [Line Items]
Fixed Rate Paid	2.576%
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap April 27 2024
Derivative [Line Items]
Fixed Rate Paid	2.619%
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap January 01 2026
Derivative [Line Items]
Fixed Rate Paid	3.836%
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swap agreements
Derivative [Line Items]
Notional Amount	$ 85,000,000	95,000,000	105,000,000
Fair Value	$ 931,000	$ 380,000	$ 322,000
Cash Flow Hedging | Designated as Hedging Instrument | Customer loan interest swap agreements
Derivative [Line Items]
Number of Positions | derivative	7	7	6
Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap October 27 2023
Derivative [Line Items]
Notional Amount	$ 0	$ 0	$ 10,000,000
Fair Value	0	0	133,000
Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap January 27 2024
Derivative [Line Items]
Notional Amount	0	10,000,000	10,000,000
Fair Value	0	22,000	176,000
Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap April 27 2024
Derivative [Line Items]
Notional Amount	10,000,000	10,000,000	10,000,000
Fair Value	21,000	86,000	209,000
Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap January 01 2026
Derivative [Line Items]
Notional Amount	75,000,000	75,000,000
Fair Value	910,000	272,000
Cash Flow Hedging | Designated as Hedging Instrument | Other Liabilities | Interest Rate Swap January 01 2026
Derivative [Line Items]
Notional Amount			75,000,000
Fair Value			(196,000)
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements
Derivative [Line Items]
Notional Amount	81,186,000	82,668,000	74,258,000
Fair Value	$ 0	$ 0	$ 0
Number of Positions | derivative	14	14	12
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Notional Amount	$ 40,593,000	$ 41,334,000	$ 37,129,000
Fair Value	$ 4,778,000	$ 4,170,000	$ 4,098,000
Number of Positions | derivative	7	7	6
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Notional Amount	$ 40,593,000	$ 41,334,000	$ 37,129,000
Fair Value	$ (4,778,000)	$ (4,170,000)	$ (4,098,000)
Number of Positions | derivative	7	7	6
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Assets | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Notional Amount	$ 40,593,000	$ 36,286,000	$ 37,129,000
Fair Value	$ 4,778,000	$ 4,259,000	$ 4,098,000
Number of Positions | derivative	7	6	6
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Assets | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Notional Amount	$ 0	$ 5,048,000	$ 0
Fair Value	$ 0	$ 89,000	$ 0
Number of Positions | derivative	0	1	0
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Liabilities | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Notional Amount	$ 0	$ 5,048,000	$ 0
Fair Value	$ 0	$ (89,000)	$ 0
Number of Positions | derivative	0	1	0
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Liabilities | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Notional Amount	$ 40,593,000	$ 36,286,000	$ 37,129,000
Fair Value	$ (4,778,000)	$ (4,259,000)	$ (4,098,000)
Number of Positions | derivative	7	6	6
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Swap March 01 2026
Derivative [Line Items]
Fixed Rate Paid	4.712%
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Swap March 01 2027
Derivative [Line Items]
Fixed Rate Paid	4.402%
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Swap March 01 2028
Derivative [Line Items]
Fixed Rate Paid	4.189%
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Swap August 01 2025
Derivative [Line Items]
Fixed Rate Paid	4.703%
Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap agreements
Derivative [Line Items]
Notional Amount	$ 150,000,000	$ 150,000,000	$ 100,000,000
Fair Value	(313,000)	(2,149,000)	(3,096,000)
Fair Value Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap August 01 2025
Derivative [Line Items]
Notional Amount	50,000,000	50,000,000	0
Fair Value	72,000	(292,000)	0
Fair Value Hedging | Designated as Hedging Instrument | Other Liabilities | Interest Rate Swap March 01 2026
Derivative [Line Items]
Notional Amount	40,000,000	40,000,000	40,000,000
Fair Value	(126,000)	(581,000)	(1,062,000)
Fair Value Hedging | Designated as Hedging Instrument | Other Liabilities | Interest Rate Swap March 01 2027
Derivative [Line Items]
Notional Amount	30,000,000	30,000,000	30,000,000
Fair Value	(132,000)	(598,000)	(958,000)
Fair Value Hedging | Designated as Hedging Instrument | Other Liabilities | Interest Rate Swap March 01 2028
Derivative [Line Items]
Notional Amount	30,000,000	30,000,000	30,000,000
Fair Value	$ (127,000)	$ (678,000)	$ (1,076,000)

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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