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Note 10 (Detail) (USD $)	3 Months Ended
	Jan. 31, 2013	Oct. 31, 2012	Jan. 31, 2013 Residential Mortgage [Member]	Jan. 31, 2013 Commercial Real Estate [Member]	Jan. 31, 2013 Letters of Credit Collateral [Member]	Oct. 31, 2012 Letters of Credit Collateral [Member]	Jan. 31, 2013 After November 1 [Member] Chase Master Repurchase Agreement [Member]	Jan. 31, 2013 Reference Rate [Member] Minimum [Member] Chase Master Repurchase Agreement [Member]	May 29, 2012 Reference Rate [Member] Minimum [Member] Customers Master Repurchase Agreement [Member]	Jan. 31, 2013 Reference Rate [Member] Minimum [Member] Credit Suisse Master Repurchase Agreement [Member]	Jan. 31, 2013 Spread [Member] Minimum [Member] Chase Master Repurchase Agreement [Member]	May 29, 2012 Spread [Member] Minimum [Member] Customers Master Repurchase Agreement [Member]	Jan. 31, 2013 Spread [Member] Minimum [Member] Credit Suisse Master Repurchase Agreement [Member]	Jan. 31, 2013 Spread [Member] Maximum [Member] Chase Master Repurchase Agreement [Member]	May 29, 2012 Spread [Member] Maximum [Member] Customers Master Repurchase Agreement [Member]	Jan. 31, 2013 Spread [Member] Maximum [Member] Credit Suisse Master Repurchase Agreement [Member]	Jan. 31, 2013 Chase Master Repurchase Agreement [Member]	Jan. 31, 2013 Customers Master Repurchase Agreement [Member]	May 29, 2012 Customers Master Repurchase Agreement [Member]	Jun. 29, 2012 Credit Suisse Master Repurchase Agreement [Member]
Secured Debt	$ 977,700,000		$ 44,400,000	$ 18,500,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	45,100,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	1,100,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,200,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,300,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,400,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	12,800,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	4.50%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	10.00%
Letters of Credit Outstanding, Amount	28,200,000	29,500,000
Cash Collateral for Borrowed Securities					28,800,000	30,700,000
Line of Credit Facility, Maximum Borrowing Capacity							50,000,000												37,500,000	50,000,000
Assets Sold under Agreements to Repurchase, Interest Rate								1.00%	0.50%	0.58%		3.00%	3.75%		5.50%	4.00%
Debt Instrument, Basis Spread on Variable Rate											1.00%			2.50%
Warehouse Agreement Borrowings	$ 23,000,000																$ 18,600,000	$ 10,400,000

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Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

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