Employee Benefits (Schedule of plan's funded status and amounts recognized in consolidated statement of financial condition) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Employee Benefits
Projected and accumulated benefit obligation	$ (20,810)	$ (23,055)
Plan assets at fair value	20,621	22,839
Funded status included in accrued expenses and other liabilities	$ (189)	$ (216)