Unaudited Condensed Consolidated Statements of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Held-to-maturity securities, fair value	$ 498,902	$ 0
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	1,000,000	1,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	117,187,500	117,187,500