Fair Value Disclosures (Details) (USD $) In Thousands	Jul. 31, 2011	Oct. 31, 2010
Corporate Securities [Member] | Level 1 [Member]
Summary of assets and (liabilities), measured at fair value on a recurring basis
Fair Value of Securities	$ 237,813	$ 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	15,020	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	24,216	22,497
Level 1 [Member] | Pre-refunded Municipal Securities [Member]
Summary of assets and (liabilities), measured at fair value on a recurring basis
Fair Value of Securities	17,237	0
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	45,320	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	(107)	(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	119	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	$ (119)	$ (130)