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Stockholders Equity Parenthetical information (Parentheticals) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Acquisition of common stock 0 48,235,000 104,661,000
Conversion of subordinated debentures $ 20,770,000 $ 0 $ 60,000
Shares of common stock by ESOP allocated, including excess income tax benefits 96,294 110,955 80,224
Shares of common stock under compensation plans issued, including excess income tax benefits 1,349,914 916,329 862,504
Dividend per share price $ 0.15 $ 0.12 $ 0.10