Borrowings (Swapped Variable Cost for Fixed Cost and Terms of Interest Rate Swap Agreements) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Commercial Loan [Member]	Dec. 31, 2012 Contract, One	Dec. 31, 2012 Contract, Two	Dec. 31, 2012 Contract, Three	Dec. 31, 2012 Contract, Four	Dec. 31, 2012 Contract, Five	Dec. 31, 2012 Interest rate swaps	Dec. 31, 2011 Interest rate swaps
Derivative [Line Items]
Notional Amount		$ 8,100	$ 10,000	$ 10,000	$ 10,000	$ 5,000	$ 8,000	$ 43,000	$ 43,000
Fixed Cost			5.09%	5.84%	5.71%	4.35%	4.14%
Maturity Date			Jun. 30, 2021	Jun. 30, 2029	Jun. 30, 2030	Mar. 30, 2031	Jul. 07, 2031
Fair value derivative liability								11,100	11,200
Cash held as collateral	$ 13,000