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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]      
Shares of common stock allocated by ESOP, including excess income tax benefits 181,181 96,294 110,955
Shares of common stock issued under compensation plans, including excess income tax benefits 3,294,995 1,349,914 916,329
Shares of common stock issued upon extinguishment of convertible senior notes 5,489,808    
Dividends on common stock (per share amount) $ 0.18 $ 0.15 $ 0.12
Conversion of subordinated debentures $ 0 $ 20,770 $ 0
Acquisition of shares of common stock     48,235