Employee Benefits (Schedule of plan's funded status and amounts recognized in consolidated statement of financial condition) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Employee Benefits and Share-based Compensation, Noncash [Abstract]
Projected and accumulated benefit obligation	$ (20,953)	$ (18,241)
Plan assets at fair value	20,628	17,459
Funded status included in other liabilities	$ (325)	$ (782)