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Notes Payable Line of Credit Due 2014 (Details) (Line of Credit 2011 [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Years
banks
Line of Credit 2011 [Member]
 
Line of Credit Facility [Line Items]  
Cash In Excess of Required by Covenants $ 109.5
Line of Credit Facility, Maximum Borrowing Capacity $ 160
Line of Credit, Number of Banks in Agreement 7
Line of Credit, Length of Credit Agreement, Years 3
Line of Credit, Interest Rate, Floating, Applicable Margin 2.00%
Line of Credit, Interest Rate, Floating, Adjusted LIBOR 3.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%
Minimum Risk-Based Captial Ratio 275.00%
Maximum Debt to Capital Ratio 0.35
Minimum Cash Coverage Ratio 100.00%
Minimum Capital to be Retained 80.00%
Minimum Portion of Net Income to be Retained 50.00%
Minimum Capital Contributions to be Retained 50.00%