Leases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lease cost
Operating lease cost	$ 872,000	$ 1,008,000	$ 1,331,000
Amortization of right-of-use asset	314,000	314,000	314,000
Interest on lease liability	121,000	125,000	129,000
Short-term lease cost	99,000	139,000	142,000
Variable lease cost	63,000	97,000	46,000
Total lease cost	1,469,000	1,683,000	1,962,000
Operating leases:
Right-of-use assets	$ 2,836,000	$ 2,887,000
Right-of-use assets, line item in Statement of Financial Position	Other assets	Other assets
Lease liabilities	$ 2,877,000	$ 2,965,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Weighted average remaining lease term (years)	8 years	6 years 6 months
Weighted average discount rate	2.70%	1.60%
Finance leases:
Right of use assets	$ 5,251,000	$ 5,565,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets.	Other assets.
Lease liabilities	$ 5,921,000	$ 6,141,000
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Long-term Borrowings	Long-term Borrowings
Weighted average remaining lease term (years)	16 years 6 months	17 years 6 months
Weighted average discount rate	2.00%	2.00%
Right-of-use assets obtained in exchange for lease liabilities	$ 775,000	$ 888,000	2,480,000
Lease incentives received, finance leases		37,000
Operating cash flows	905,000	1,823,000	1,313,000
Operating cash flows	121,000	125,000	129,000
Finance cash flows	220,000	440,000	195,000
Total cash flows	$ 1,246,000	$ 2,388,000	$ 1,637,000