Assets and Liabilities Subject to Enforceable Master Netting Agreements (Schedule of Liabilities Subject to an Enforceable Master Netting Arrangement or Repurchase Agreements) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investment security collateral as a percentage of borrowing	102.00%
Interest Rate Swap [Member]
Gross Amounts of Recognized (Assets)/Liabilities	$ (1,689)	$ (781)
Gross Amounts Offset in the Statement of Condition	0	0
Net Amounts of (Assets)/Liabilities Presented in the Statement of Condition	(1,689)	(781)
Gross Amounts Not Offset in the Statement of Condition: Financial Instruments	1,689	781
Gross Amounts Not Offset in the Statement of Condition: Cash Collateral Pledged	0	0
Net amount	0	0
Repurchase Agreements [Member]
Gross Amounts of Recognized (Assets)/Liabilities	47,805	48,845
Gross Amounts Offset in the Statement of Condition	0	0
Net Amounts of (Assets)/Liabilities Presented in the Statement of Condition	47,805	48,845
Gross Amounts Not Offset in the Statement of Condition: Financial Instruments	(47,805)	(48,845)
Gross Amounts Not Offset in the Statement of Condition: Cash Collateral Pledged	0	0
Net amount	$ 0	$ 0