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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]      
Shares of common stock allocated by ESOP, including excess income tax benefits     58,618
Shares of common stock issued under compensation plans, including excess income tax benefits 964,053 944,504 1,567,607
Shares of common stock issued upon extinguishment of convertible senior notes     3,959,396
Shares of common stock issued to settle warrants that have reached their expiration 92,998 47,868  
Dividends on common stock, per share amount $ 0.24 $ 0.22 $ 0.20