Variable Interest Entities Schedule of Variable Interest Entities (Details) (USD $)	Dec. 31, 2012
Variable Interest Entity [Line Items]
Current recorded investment of variable interest entities	$ 1,400,000
Company's obligation to pay to variable interest entities	$ 376,000
Number of years to pay obligations to variable interest entities	2
Investment in low income housing tax credit limited partnerships
Variable Interest Entity [Line Items]
Number of variable interest entities	9
Limited Liability Partnership for Development and Restoration in Low and Moderate income Areas
Variable Interest Entity [Line Items]
Number of variable interest entities	1