Consolidated Statements Of Financial Condition (Parenthetical) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Securities held-to-maturity, at fair value	$ 706,748,000	$ 493,230,000
FHLB stock	$ 43,500,000	$ 40,700,000
Series B Preferred Stock [Member]
Preferred stock, Liquidation value	$ 1,000	$ 1,000
Preferred stock, Shares authorized	1,000	1,000
Preferred stock, Shares issued	244	244
Preferred stock, Shares outstanding	244	244
Common Stock [Member]
Common stock, Stated value per share	$ 1.00	$ 1.00
Common stock, Shares authorized	174,000	174,000
Common stock, Shares issued	69,737	68,978
Common stock, Shares outstanding	68,888	68,209
Treasury shares	849	769
Nonvoting Common Stock [Member]
Common stock, Stated value per share	$ 1.00	$ 1.00
Common stock, Shares authorized	5,000	5,000
Common stock, Shares issued	3,536	3,536
Common stock, Shares outstanding	3,536	3,536