Consolidated Statements of Condition (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Sep. 30, 2011 Series A Preferred Stock [Member]	Dec. 31, 2010 Series A Preferred Stock [Member]	Sep. 30, 2010 Series A Preferred Stock [Member]	Sep. 30, 2011 Series B Preferred Stock [Member]	Dec. 31, 2010 Series B Preferred Stock [Member]	Sep. 30, 2010 Series B Preferred Stock [Member]
Interest-bearing deposits with other banks, restricted for securitization investors	$ 37,165	$ 36,620	$ 47,780
Net loans, restricted for securitization investors	$ 643,466	$ 646,268	$ 635,755
Preferred stock, par value	$ 0	$ 0	$ 0
Preferred stock, shares authorized	20,000,000	20,000,000	20,000,000
Preferred stock, liquidation value				$ 1,000	$ 1,000	$ 1,000	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares issued				50,000	50,000	50,000	0	0	250,000
Preferred stock, shares outstanding				50,000	50,000	50,000	0	0	250,000
Common stock, par value	$ 0	$ 0	$ 0
Common stock, stated value	$ 1	$ 1	$ 1
Common stock, shares authorized	60,000,000	60,000,000	60,000,000
Common stock, shares issued	35,926,137	34,864,068	31,145,332
Treasury stock, shares	2,071	0	1,592