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Selected Quarterly Financial Dara (Unaudited): Selected financial data (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract]              
Recapture of loan losses $ 0 $ 1,000 $ 250 $ 0 $ 1,250 $ 0 $ 1,525