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Notes Payable and Open Line of Credit Notes Payable and Open Line of Credit (Details) - USD ($)
$ in Millions
9 Months Ended
May 17, 2018
Mar. 23, 2018
Sep. 30, 2018
Sep. 30, 2017
Mar. 22, 2018
Jul. 26, 2013
Debt Disclosure [Abstract]            
Line of Credit Facility, Current Borrowing Capacity         $ 100.0 $ 100.0
Line of Credit Facility, Expiration Period   1 year        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances $ 85.0          
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate 15 years          
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 3.96%          
Debt Prepayment Cost     $ 0.4 $ 0.0