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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Interest expense incurred during the reporting period on junior subordinated debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures.

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Subordinated debt (Details)						3 Months Ended	6 Months Ended
Subordinated debt (Details)	Jun. 30, 2025 USD ($)	Jun. 06, 2025 USD ($)	Jun. 01, 2025	Jul. 01, 2024 USD ($) item	Jun. 01, 2020	Jun. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Instrument
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:SecuredOvernightFinancingRateSofrMember		us-gaap:SecuredOvernightFinancingRateSofrMember
Junior subordinated debt	$ 8,088,000					$ 8,088,000	$ 8,088,000	$ 8,039,000
Interest on junior subordinated debt						188,000	374,000
Subordinate Notes Due 2030
Debt Instrument
Aggregate principal amount	$ 33,000,000					33,000,000	33,000,000
Interest rate	5.375%				5.375%
Duration interest rate in effect					5 years
Floated interest rate			9.08%
Basis points added to the reference rate to compute the variable rate on the debt instrument		411
Subordinate Notes Due 2030 \| Minimum
Debt Instrument
Floated interest rate					4.75%
Junior subordinated debt \| FNCB
Debt Instrument
Aggregate principal amount				$ 10,300,000
Fair market value				$ 8,000,000
Trust preferred securities \| FNCB
Debt Instrument
Basis spread adjustment				0.26161%
Percentage of margin				1.67%
Maximum number of consecutive quarters until which interest payment can be deferred relating to the debt instrument \| item				20
Junior subordinated debt	$ 8,100,000					$ 8,100,000	8,100,000
Interest on junior subordinated debt							$ 374,000
Subordinate Notes Due 2035
Debt Instrument
Aggregate principal amount		$ 85,000,000
Interest rate		7.75%
Percentage of debt redeemed		100.00%