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Description of Business and Significant Accounting Policies - Additional Paid In Capital (Provident Shares Held In Escrow) (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 13 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2010 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2017
US Government Securities and Other Securities - Deposits and Receivables |  | $ 500,000,000 |  |  |  |  | $ 251,354,305
Business Combination, Consideration Transferred |  | $ 45,000,000 |  |  |  |  |
Provident Group Asset Acquisition [Member] |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  | $ 5,000,000 |  |
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Total Shares Purchased and Placed In Escrow |  |  |  |  |  | 214,325 |
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Period From Date of Closing Over Which Shares Will be Released from Escrow | 5 years |  |  |  |  |  |
Stock Redeemed or Called During Period, Shares |  |  | 204,271 |  |  |  |
Business Combination, Cost of Acquired Entity, Equity Interest Issued or Issuable, Shares Released from Escrow |  |  | 0 | 10,054 |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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