Loans sales and securitizations (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Residential Mortgage [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Constant pre-payment rate, actual			18.64%
Constant pre-payment rate, 10% adverse change	$ (4,729)		$ (4,729)
Constant pre-payment rate, 20% adverse change	(9,388)		(9,388)
Spread over forward interest rate swap rates, bps, actual			6.58%
Spread over forward interest rate swap rates, 10% adverse change	(1,741)		(1,741)
Spread over forward interest rate swap rates, 20% adverse change	(3,482)		(3,482)
Residential Mortgage [Member]
Summarize the changes in servicing rights using the amortization method
Carrying value, beginning of year	84,742	46,733	70,516	38,165
New servicing assets created	4,572	7,506	24,549	24,247
Impairment Charge	(14,057)	(2,043)	(14,057)	(6,899)
Amortization and other	(3,804)	(2,757)	(9,555)	(6,074)
Carrying value, end of period	71,453	49,439	71,453	49,439
Fair value, end of period	71,467	50,832	71,467	50,832
Automobile Loan [Member]
Summarize the changes in servicing rights using the amortization method
Carrying value, beginning of year	49	373	97	12,912
New servicing assets created	16,039	0	16,039	0
Amortization and other	(743)	(228)	(791)	(12,767)	[1]
Carrying value, end of period	15,345	145	15,345	145
Fair value, end of period	$ 16,039	$ 387	$ 16,039	$ 387

[1] The nine months ended September 30, 2010, included a $12.4 million reduction related to the consolidation of a VIE in the 2010 first quarter.