Subsequent Events (Details) (Repayment of Debt, USD $) In Thousands, unless otherwise specified	0 Months Ended
	Jul. 31, 2012 1998 Debenture Subordinated Debt	Jul. 31, 2012 1998 Debenture Secured Debt	Jul. 31, 2012 1998 Preferred Securities Securities Sold under Agreements to Repurchase	Jul. 15, 2012 2005 Securitization and Sale of Revolving Mortgage Loans Secured Debt
Subsequent Event [Line Items]
Stated interest rate for debt (percent)	8.05%		8.05%
Face value of debt instrument	$ 154,640		$ 150,000
Amount of debt redeemed	163,569		158,661
Redeemed debt face amount (percent)	102.42%		102.42%
Reductions in long-term borrowings from repayments of debt		154,640		21,565
Prepayment penalty interest rate (percent)		2.42%
Prepayment penalty expense		$ 3,630