CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Held to maturity, fair value	$ 1,764,181	$ 1,657,950
Junior subordinated debentures issued to capital trusts, fair value	$ 150,001	$ 147,595
Preferred stock, par value
Preferred stock, shares authorized	30,000,000	30,000,000
Preferred stock, shares issued
Common stock, par value
Common stock, shares authorized	232,023,233	232,023,233
Common stock, shares issued	199,254,687	198,499,275
Treasury stock, shares	0	61,004