Annual report pursuant to Section 13 and 15(d)

Description of Business - Earnings per share (Details)

v3.8.0.1
Description of Business - Earnings per share (Details) - $ / shares
shares in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income per common share - Basic (in dollars per share) $ 0.25 $ 0.30 $ 0.28 $ 0.29 $ 0.43 $ 0.29 $ 0.32 $ 0.22 $ 1.13 $ 1.25 $ 1.22
Income per common share - Diluted (in dollars per share) $ 0.25 $ 0.30 $ 0.28 $ 0.29 $ 0.43 $ 0.29 $ 0.32 $ 0.22 $ 1.13 $ 1.25 $ 1.22
Weighted average common shares - Basic                 4,299 4,503 4,634
Weighted average common shares - Diluted                 4,299 4,503 4,634
As Reported                      
Income per common share - Basic (in dollars per share)                   $ 1.31 $ 1.26
Income per common share - Diluted (in dollars per share)                   $ 1.31 $ 1.25
Weighted average common shares - Basic                   4,503 4,634
Weighted average common shares - Diluted                   4,514 4,653