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Earnings Per Share Earnings Per Share (Numerator and Denominator) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share [Abstract]    
Net income $ 5,258 $ 4,459
Less: Preferred Stock dividends (4) (4)
Net income available to common stockholders 5,254 4,455
Effect of dilutive securities, Convertible junior subordinated debentures (TIDES) 484  
Net income available to common stockholders and assumed conversions $ 5,738  
Net income available to common stockholders (in shares) 18,139 18,265
Effect of dilutive securities, Stock options (in shares) 197 55
Effect of dilutive securities, Convertible junior subordinated debentures (in shares) 4,392 0
Net income available to common stockholders and assumed conversions (in shares) 22,728 18,320
Basic earnings per common share (in dollars per Share) $ 0.29 $ 0.24
Diluted earnings per common share (in dollars per Share) $ 0.25 $ 0.24