Annual report pursuant to Section 13 and 15(d)

Nature of Operations and Summary of Significant Accounting Policies - Basic and Diluted Income Per Share (Details)

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Nature of Operations and Summary of Significant Accounting Policies - Basic and Diluted Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Basic EPS:    
Net income available to common stockholders $ 47,241 $ 20,360
Less: undistributed earnings to participating securities 0 127
Net income allocated to common stockholders $ 47,241 $ 20,360
Net income allocated to common stockholders (in shares) 12,302 12,131
Net income allocated to common stockholders (in dollars per share) $ 3.84 $ 1.67
Effect of dilutive securities:    
Warrants to purchase common stock (in shares) 21 421
Plus: reallocation of undistributed earnings to participating securities   $ 5
Diluted EPS:    
Net income allocated to common stockholders plus assumed conversions $ 47,241 $ 20,238
Net income allocated to common stockholders plus assumed conversions (in shares) 12,372 12,600
Net income allocated to common stockholders plus assumed conversions (in dollars per share) $ 3.82 $ 1.61
Restricted Stock    
Effect of dilutive securities:    
Non-vested restricted stock (in shares) 49 48
Distributed    
Basic EPS:    
Net income available to common stockholders $ 47,241 $ 20,233
Net income allocated to common stockholders $ 47,241 $ 20,233
Net income allocated to common stockholders (in shares) 12,302 12,131
Net income allocated to common stockholders (in dollars per share) $ 3.84 $ 1.67