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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]            
Investments $ 2,942   $ 2,942   $ 3,032  
Investment income (loss) $ 52 $ 688 $ (91) $ 671    
Kingstone Holding Company            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage 15.00%   15.00%     15.00%
Investment income (loss)     $ (91) $ 671