Consolidated Statements Of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements Of Financial Condition [Abstract]
Trading securities pledged	$ 607,586	$ 393,888
Investments at fair value	$ 236,434	$ 211,208
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	0	0
Preferred stock, shares issued	3,000,000	3,000,000
Exchangeable common stock, par value	$ 0.15	$ 0.15
Exchangeable common stock, shares issued	0	172,242
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	97,000,000	97,000,000
Common stock, shares issued	54,967,858	53,547,774
Treasury stock, shares	77,577	1,769,096
Unearned employee stock ownership plan, shares	24,405	73,215