Fair Value Measurements (Details) $ in Thousands	9 Months Ended	12 Months Ended
Fair Value Measurements (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Fair Value Measurements [Abstract]
Net derivative liability	$ 4,332	$ 5,817
Net derivative asset	7,487	10,370
Collateral-Dependent Loans, estimated selling cost	88	253
IRLC Assets [Member]
Fair Value Measurements [Abstract]
Net derivative asset	425	317
IRLC Assets [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements [Abstract]
Net derivative liability	425	317
Net derivative asset	$ 425	$ 317
Valuation Technique, Discounted Cash Flow [Member] \| Minimum [Member] \| IRLC Assets [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements [Abstract]
Derivative Asset, Measurement Input (in Pure) \| Pure	0.7676	0.7635
Valuation Technique, Discounted Cash Flow [Member] \| Maximum [Member] \| IRLC Assets [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements [Abstract]
Derivative Asset, Measurement Input (in Pure) \| Pure	0.9757	1

CITIZENS FINANCIAL SERVICES INC 10-Q