Consolidated Statements of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Financial Condition
Trading securities pledged	$ 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	172,242	897,618
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	97,000,000	97,000,000
Common stock, shares issued	53,547,774	52,822,428
Treasury stock, shares	1,769,096	2,235,473
Unearned employee stock ownership plan, shares	73,215	122,024