Benefit Plans - Defined Benefit Plans - Components of Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Supplemental Retirement Plan
Components of net periodic benefit cost:
Service cost	$ 50	$ 48
Interest cost	318	324
Amortization of net actuarial loss	27	13
Net periodic benefit cost	395	385
Amount recognized in other comprehensive income (loss)	18	8
Split-Dollar Life Insurance Benefit Plan
Components of net periodic benefit cost:
Amortization of prior transition obligation and actuarial losses	(52)	(47)
Interest cost	86	91	$ 365
Net periodic benefit cost	34	44
Amount recognized in other comprehensive income (loss)	$ (52)	$ (48)