Office Property and Equipment (Schedule of Office Property And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total cost	$ 30,780	$ 30,561
Less accumulated depreciation	(23,144)	(21,912)
Office property and equipment, net	7,636	8,649
Land [Member]
Property, Plant and Equipment [Line Items]
Total cost	840	840
Buildings And Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	13,129	13,063
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 16,811	$ 16,658
Minimum [Member] | Buildings And Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Maximum [Member] | Buildings And Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	31 years 6 months
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years