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Financial Derivative Instruments (Details)	Sep. 30, 2023 USD ($) derivative	Dec. 31, 2022 USD ($) derivative	Sep. 30, 2022 USD ($) derivative
Customer loan interest swap agreements
Derivative [Line Items]
Collateral posted	$ 0
Designated as Hedging Instrument | Interest rate swap agreements
Derivative [Line Items]
Derivative asset	255,000,000	$ 30,000,000	$ 30,000,000
Fair Value	$ 2,489,000	689,000	633,000
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]
Derivative asset	$ 105,000,000	30,000,000	30,000,000
Fair Value	$ 1,784,000	$ 689,000	$ 633,000
Cash Flow Hedging | Designated as Hedging Instrument | Customer loan interest swap agreements
Derivative [Line Items]
Number of derivative instruments | derivative	6	6	6
Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap October 27 2023
Derivative [Line Items]
Derivative asset	$ 10,000,000	$ 10,000,000	$ 10,000,000
Fair Value	20,000	187,000	179,000
Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap January 27 2024
Derivative [Line Items]
Derivative asset	10,000,000	10,000,000	10,000,000
Fair Value	92,000	233,000	212,000
Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap April 27 2024
Derivative [Line Items]
Derivative asset	10,000,000	10,000,000	10,000,000
Fair Value	159,000	269,000	242,000
Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap January 01 2026
Derivative [Line Items]
Derivative asset	75,000,000	0	0
Fair Value	1,513,000	0	0
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements
Derivative [Line Items]
Fair Value	$ 0	$ 0	$ 0
Number of derivative instruments | derivative	12	12	12
Derivative notional amount	$ 73,144,000	$ 74,822,000	$ 77,256,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value	$ 6,031,000	$ 4,910,000	$ 5,365,000
Number of derivative instruments | derivative	6	6	6
Derivative notional amount	$ 36,572,000	$ 37,411,000	$ 38,628,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value	$ (6,031,000)	$ (4,910,000)	$ (5,365,000)
Number of derivative instruments | derivative	6	6	6
Derivative notional amount	$ 36,572,000	$ 37,411,000	$ 38,628,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Assets | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value	$ 6,031,000	$ 4,910,000	$ 5,365,000
Number of derivative instruments | derivative	6	6	6
Derivative notional amount	$ 36,572,000	$ 37,411,000	$ 38,628,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Liabilities | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value	$ (6,031,000)	$ (4,910,000)	$ (5,365,000)
Number of derivative instruments | derivative	6	6	6
Derivative notional amount	$ 36,572,000	$ 37,411,000	$ 38,628,000
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]
Derivative asset	$ 150,000,000	0	0
Fair Value	705,000	0	0
Fair Value Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap March 01 2026
Derivative [Line Items]
Derivative asset	40,000,000	0	0
Fair Value	63,000	0	0
Fair Value Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap March 01 2027
Derivative [Line Items]
Derivative asset	30,000,000	0	0
Fair Value	120,000	0	0
Fair Value Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap March 01 2028
Derivative [Line Items]
Derivative asset	30,000,000	0	0
Fair Value	250,000	0	0
Fair Value Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap August 01 2025
Derivative [Line Items]
Derivative asset	50,000,000	0	0
Fair Value	$ 272,000	$ 0	$ 0

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Nominal or face amount used to calculate payments on the derivative asset.

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

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