Fair Value Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Oct. 31, 2010
Level 1 [Member] | Corporate Securities [Member]
Summary of assets and (liabilities), measured at fair value on a recurring basis
Fair Value of Securities	$ 233,572	$ 0
Level 1 [Member] | US Treasury Securities [Member]
Summary of assets and (liabilities), measured at fair value on a recurring basis
Fair Value of Securities	0	175,370
Level 1 [Member] | US Agency Securities [Member]
Summary of assets and (liabilities), measured at fair value on a recurring basis
Fair Value of Securities	0	22,497
Level 2 [Member] | Residential Mortgage Loans Held for Sale [Member]
Summary of assets and (liabilities), measured at fair value on a recurring basis
Fair value of loans	63,175	93,644
Level 2 [Member] | Forward Loan Commitments - Residential Mortgage Loans Held for Sale [Member]
Summary of assets and (liabilities), measured at fair value on a recurring basis
Fair Value of Commitments	218	(459)
Level 2 [Member] | Interest Rate Lock Commitments [Member]
Summary of assets and (liabilities), measured at fair value on a recurring basis
Fair Value of Commitments	(147)	130
Level 2 [Member] | Forward Loan Commitments [Member]
Summary of assets and (liabilities), measured at fair value on a recurring basis
Fair Value of Commitments	$ 147	$ (130)