Nature of Operations and Summary of Significant Accounting Policies (Details Textual)	Apr. 30, 2012 Segment Commercial_Bank Subsidiary
Nature of Operations and Summary of Significant Accounting Policies (Textual) [Abstract]
Number of bank subsidiaries prior to combination of bank subsidiaries	11
Number of bank subsidiaries subsequent to combination of bank subsidiaries	1
Number of bank divisions subsequent to combination of bank subsidiaries	11
Number of operating segments subsequent to combination of bank subsidiaries	1