Earnings per common share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator    
Net income (loss) - basic and diluted $ 402 $ (5)
Preferred stock dividend and accretion (178) (163)
Preferred stock principal forgiveness 0 4,404
Preferred stock dividend forgiveness 0 2,215
Net income available to common shareholders $ 224 $ 6,451
Denominator    
Weighted average shares outstanding - basic (in shares) 1,418 409
Dilutive effect of common stock options and restricted stock awards (in shares) 0 10
Weighted average shares outstanding - diluted (in shares) 1,418 419
Earnings per share - basic (in dollars per share) $ 0.16 $ 15.77
Earnings per share - diluted (in dollars per share) $ 0.16 $ 15.40