Derivative Financial Instruments (Schedule of Offsetting of Derivative Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets	$ 595	$ 786
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0	0
Net Amounts Of Assets Presented on the Condensed Consolidated Balance Sheets	595	786
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets: Financial Instruments	(330)	(362)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets: Cash Collateral Pledged	0	0
Net Amount	265	424
Bank of America
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets	67	323
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0	0
Net Amounts Of Assets Presented on the Condensed Consolidated Balance Sheets	67	323
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets: Financial Instruments	(166)	(64)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets: Cash Collateral Pledged	0	0
Net Amount	(99)	259
Wells Fargo
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets	528	463
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0	0
Net Amounts Of Assets Presented on the Condensed Consolidated Balance Sheets	528	463
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets: Financial Instruments	(164)	(298)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets: Cash Collateral Pledged	0	0
Net Amount	$ 364	$ 165