Notes Payable, Federal Home Loan Bank Advances, Other Borrowings, Secured Borrowings And Subordinated Notes (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Oct. 28, 2011
Notes payable	$ 1,000,000	$ 3,004,000	$ 1,000,000	$ 1,000,000
Loan agreement with unaffiliated banks, amount		51,000,000
Revolving Note		50,000,000
Revolving note maturity date		Oct. 28, 2011
Notes payable, due date		Jun. 01, 2015
Revolving note outstanding balance		50,000,000
Interest rate points on borrowings		450
Restated credit agreement term loan, Amount					1,000,000
Restated credit agreement term loan, Maturity Date					June 1, 2015
Restated credit agreement revolving credit facility, Maturity Date					October 26, 2012
Restated credit agreement revolving credit facility, Amount					75,000,000
Percentage of commitment fees payment		0.50%
Current interest rate		1.25%
Restructured FHLB advances		36,000,000		220,000,000
Prepayment fees	1,500,000			10,100,000
Customer balances in sweep accounts		100,600,000
Short-term borrowings from brokers		313,700,000
Subordinated notes	55,000,000	40,000,000	55,000,000	50,000,000
Quarterly principal and interest payments		4,300,000
Repayment of subordinated note		10,000,000	5,000,000
Secured borrowings owed to securitization investors	600,000,000	600,000,000	600,000,000	600,000,000
Notes bear an annual interest rate		1.45%
Notes average term, years		2.93
Notes unpaid balance due		Feb. 17, 2014
Subordinated debt, annual principal payment		5,000,000
Interest rate base point on notes		130
Great Lakes Advisors [Member]
Unsecured promissory note		2,000,000
Federal funds rate plus basis points		plus 100 basis points
October 2002 [Member]
Subordinated notes		10,000,000
April 2003 [Member]
Subordinated notes		10,000,000
October 2005 [Member]
Subordinated notes		20,000,000
Subordinated Debt [Member]
Repayment of subordinated note		4,600,000
Junior Subordinated Debt [Member]
Subordinated debentures interest rate		6.84%
Junior subordinated notes		44,700,000
Junior subordinated borrowing interest rate		9.50%
Agreement [Member]
Notes payable		$ 1,000,000
Interest rate on loan agreement		4.50%