Loans and Credit Quality (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2010	Dec. 31, 2009
Financing Receivable, Impaired [Line Items]
Specific reserves related to restructured loans	$ (17,860,000)		$ (17,860,000)			$ (78,968,000)
Loans charged off to carrying value	224,072,000		224,072,000			419,988,000
Loans and Credit Quality (Textuals) [Abstract]
Outstanding Loan Balance	5,600,000,000		5,600,000,000			6,400,000,000
Interest and fee receivables	33,600,000		33,600,000			52,700,000
Carrying value of loans held for investment transferred to loans held for sale	135,400,000	55,200,000	165,700,000	92,800,000
Carrying value of impaired loans held for investment transferred to loans held for sale	135,400,000	41,700,000	165,700,000	70,700,000
Losses due to valuation adjustments from transfers of loans to loans held for sale	1,400,000	7,500,000	1,400,000	7,500,000
Loans transferred from held to sale to held for investment	0	0	28,600,000	10,500,000
Recognized net pre-tax [gain/loss] on the sale of loans	3,100,000	7,600,000	4,400,000	7,500,000
Loans held for sale classified as non accrual loans	118,700,000		118,700,000			14,700,000
Loans held for investment pledged to the FHLB as collateral for financing facility	367,200,000		367,200,000			166,100,000
Unpaid principal balance of purchased loans held for investment	32,000,000		347,300,000
Fair value write-downs on non-accrual loans held for sale	0	5,600,000	0	5,600,000
Cash basis interest income on impaired loans	0	200,000	100,000	300,000
Carrying value of impaired loans with no related allowance	329,200,000		329,200,000			588,700,000
Interest lost on non accrual impaired loans	28,700,000	39,900,000	61,700,000	79,400,000
Aggregate carrying value of loans involved in troubled debt restructurings	68,700,000	361,000,000	223,500,000	561,900,000
Loans not classified as impaired	2		2
Aggregate carrying value of Loans not classified as impaired	35,600,000		35,600,000
REO classified as held for sale	47,012,000	138,950,000	47,012,000	138,950,000	70,050,000	92,265,000	136,277,000	101,401,000
Gain on the sales of REO held for sale	1,100,000		1,400,000
Loss on the sales of REO held for sale		1,100,000		1,400,000
REO classified as held for use	1,400,000		1,400,000			1,400,000
Impairment losses, REO held for use		5,600,000		10,200,000
Loans acquired through foreclosure	24,900,000		24,900,000			55,800,000
Valuation allowances on loans acquired through foreclosure	400,000		400,000			3,200,000
Loans that had no recorded charge offs or specific reserves	186,000,000		186,000,000			366,300,000
Sales of other investments	9,923,000	16,048,000	20,020,000	25,472,000
Restructured Loans [Member]
Financing Receivable, Impaired [Line Items]
Charge offs related to loans	63,700,000	52,400,000	134,400,000	80,600,000
Specific reserves related to restructured loans	11,500,000		11,500,000			35,500,000
Impaired Loans Charged Off To Carrying Value [Member]
Financing Receivable, Impaired [Line Items]
Loans charged off to carrying value	$ 143,200,000		$ 143,200,000			$ 222,400,000