Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Securities available-for-sale, pledged as collateral (in dollars)	$ 690,336	$ 728,558
Corporate loans, allowance for loan losses (in dollars)	191,407	209,030
Equity investments, at estimated fair value, pledged as collateral (in dollars)	$ 13,410	$ 12,036
Preferred shares, shares authorized	50,000,000	50,000,000
Preferred shares, shares issued	0	0
Preferred shares, shares outstanding	0	0
Common shares, shares authorized	500,000,000	500,000,000
Common shares, shares issued	178,145,482	177,848,565
Common shares, shares outstanding	178,145,482	177,848,565