Derivative Financial Instruments (Balance sheet category and fair values of derivative instruments (cash flow hedges)) (Details) (Other Liabilities, USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Interest Rate Swap 1
Derivatives, Fair Value [Line Items]
Notional Amount	$ 12,046	$ 13,002
Fair Value	(509)	(711)
Receive Rate	2.93%	2.961%
Weighted Average Pay Rate	5.14%	5.14%
Interest Rate Swap 2
Derivatives, Fair Value [Line Items]
Notional Amount	25,000	25,000
Fair Value	(289)	(708)
Receive Rate	0.254%	0.308%
Weighted Average Pay Rate	2.58%	2.58%
Interest Rate Swap 3
Derivatives, Fair Value [Line Items]
Notional Amount	20,000	20,000
Fair Value	(1,637)	(2,186)
Receive Rate	0.26%	0.311%
Weighted Average Pay Rate	3.22%	3.22%
Interest Rate Swap 4
Derivatives, Fair Value [Line Items]
Notional Amount	20,000	20,000
Fair Value	$ (1,905)	$ (3,020)
Receive Rate	0.271%	0.351%
Weighted Average Pay Rate	3.355%	3.355%