Employee Benefits (Schedule of plan's funded status and amounts recognized in consolidated statement of financial condition) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Employee Benefits and Share-based Compensation, Noncash [Abstract]
Projected and accumulated benefit obligation	$ (19,557)	$ (20,953)
Plan assets at fair value	19,609	20,628
Funded status included in accrued expenses and other liabilities	$ 52	$ (325)