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Interim Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Shares to be Issued for Deferred Compensation Obligations
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balances at Dec. 31, 2016 $ 187,899 $ 139,525 $ 5,038 $ 46,114 $ (2,778)
Beginning balances, shares at Dec. 31, 2016   7,821,069      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Comprehensive income (loss) 4,374     3,136 1,238
Issuance of common stock 1,770 $ 1,770      
Issuance of common stock, shares   63,866      
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 168 (168)    
Share based payment awards under equity compensation plan 178   178    
Common stock purchased for deferred compensation obligations (123) (123)      
Common stock repurchased pursuant to publicly announced repurchase plan (1,169) $ (1,169)      
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (41,815)      
Cash dividends (1,953)     (1,953)  
Ending balances at Mar. 31, 2017 190,976 $ 140,171 5,048 47,297 (1,540)
Ending balances, shares at Mar. 31, 2017   7,843,120      
Beginning balances at Dec. 31, 2017 $ 194,905 $ 140,277 5,502 51,728 (2,602)
Beginning balances, shares at Dec. 31, 2017 7,857,293 7,857,293      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Comprehensive income (loss) $ (2,815)     3,462 (6,277)
Issuance of common stock 1,616 $ 1,616      
Issuance of common stock, shares   59,560      
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 146 (146)    
Share based payment awards under equity compensation plan 146   146    
Common stock purchased for deferred compensation obligations (101) (101)      
Common stock repurchased pursuant to publicly announced repurchase plan (620) $ (620)      
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (22,512)      
Cash dividends (2,041)     (2,041)  
Ending balances at Mar. 31, 2018 $ 191,090 $ 141,318 $ 5,502 52,926 (8,656)
Ending balances, shares at Mar. 31, 2018 7,894,341 7,894,341      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption $ 0     $ (223) $ 223