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Investments in Non-Performing Loan Portfolios and Foreclosed Real Estate (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Apr. 30, 2011
Dec. 28, 2011
Oct. 31, 2011
Summary of accretable yield and nonaccretable difference on investments in non-performing loans portfolios            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition         $ 52,524  
Nonaccretable difference         (5,125)  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition         47,399  
Certain loans acquired in transfer not accouted for as debt security,acquisition date accret cash flow         (20,514)  
Non-performing loans carrying amount         26,885  
Investment in non-performing loan portfolios            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 186,031   186,031     171,559
Discount on acquired loans (108,269)   (108,269)     (108,325)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 77,762   77,762     63,234
Activity in accretable yield for investment in non-performing loan portfolios            
Begining balance 57,844    42,326       
Certain Loans Acquired in Transfer Not Accounted for as a Debt Security, Accret Dff, at acquistion    33,212 20,514 33,212    
Additions 3,010    2,826       
Accretions (3,331) (500) (6,559) (500)    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans (8,300)    (9,949)       
Other 33    98       
Ending balance 49,256 32,712 49,256 32,712    
Schedule of changes in real estate owned [Roll Forward]            
Real Estate Owned - total beginning of period 6,488   5,939      
Real Estate Owned Additions 11,638   12,802      
Real Estate Owned, Sales      (615)      
Real Estate Held And Used Depreciation (18)   (18)      
Real Estate Owned - total end of period $ 18,108   $ 18,108