Employee Benefit Plans - Employee Stock Ownership Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 1988	Dec. 31, 1987	Dec. 31, 1985
Postretirement Benefit Plan
Amount borrowed						$ 2,000,000
Outstanding shares subject to repurchase obligation	0
Employee stock ownership plan, term of loan	40 years
Employee stock ownership plan, amount of additional loan				$ 1,942,000	$ 1,942,000
Employee stock ownership plan debt structure interest rate description	prime rate
ESOP, number of allocated shares since inception	321,141
ESOP, number of unallocated shares	26,752	41,270
ESOP, compensation expenses	$ 101,000	$ 101,000
Other Postretirement Benefit Plans
Postretirement Benefit Plan
Grading down percentage foe each year	0.50%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	10.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	$ 97,000
Future obligation of benefits	4,262,000	$ 4,062,000	$ 5,865,000
Employer contribution	$ 147,000