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, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Interest Rate Swap [Member]
Gross Amounts of Recognized Liabilities	$ 748	$ 849
Gross Amounts Offset in the Statement of Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Condition	748	849
Gross Amounts Not Offset in the Statment of Condition: Financial Insturments	(748)	(849)
Gross Amounts Not Offset in the Statment of Condition: Cash Collateral Pledged	0	0
Net amount	0	0
Repurchase Agreements [Member]
Gross Amounts of Recognized Liabilities	38,633	39,257
Gross Amounts Offset in the Statement of Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Condition	38,633	39,257
Gross Amounts Not Offset in the Statment of Condition: Financial Insturments	(38,633)	(39,257)
Gross Amounts Not Offset in the Statment of Condition: Cash Collateral Pledged	0	0
Net amount	$ 0	$ 0