Variable Interest Entities (VIE) (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Variable Interest Entity [Line Items]
Long-term Debt	$ 182,735,000	$ 207,044,000
Ownership in Liberty Mews Limited Partnership	99.90%
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Long-term Debt	41,700,000
Equity Method Investments	1,300,000
Ownership in Liberty Mews Limited Partnership	99.99%
VIE financing	10,600,000
VIE purpose	purchase the land and construct a 36-unit low income housing rental complex
Construction and Development Costs	10,600,000
Partnership total assets	10,000,000	10,900,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Junior Subordinated Debt [Member]
Variable Interest Entity [Line Items]
Long-term Debt	5,000,000
Bank [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
VIE financing	6,100,000
Federal investment tax credits	$ 8,400,000
Federal investment tax credit duration	10