Consolidated Statements of Condition (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Held-to-Maturity, Fair Value (in dollars)	$ 4,774,032	$ 4,697,587
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized shares	500,000,000	500,000,000
Common Stock, issued shares	57,620,212	57,480,846
Common Stock, outstanding shares	44,467,593	44,490,385
Treasury Stock, Shares	13,152,619	12,990,461