Consolidated Statements Of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Consolidated Statements Of Financial Condition [Abstract]
Trading securities pledged	$ 425,845	$ 392,395
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	0	0
Exchangeable common stock, par value	$ 0.15	$ 0.15
Exchangeable common stock, shares issued	34,593	172,242
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	97,000,000	97,000,000
Common stock, shares issued	53,685,423	53,547,774
Treasury stock, shares	92.359	1,769,096
Unearned employee stock ownership plan, shares	61,013	73,215