Consolidated Statements of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Consolidated Statements of Financial Condition
Trading securities pledged	$ 300,249	$ 272,172
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	172,672	897,618
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	97,000,000	97,000,000
Common stock, shares issued	53,546,813	52,822,428
Treasury stock, shares	700,364	2,235,473
Unearned employee stock ownership plan, shares	97,619	122,024