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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) 13,345     10,516 2,829
Issuance of common stock 4,999 $ 4,999      
Issuance of common stock, shares   178,712      
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 176 (176)    
Share based payment awards under equity compensation plan 502   502    
Common stock purchased for deferred compensation obligations (327) (327)      
Common stock repurchased pursuant to publicly announced repurchase plan (4,005) $ (4,005)      
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (143,117)      
Cash dividends (5,950)     (5,950)  
Ending balances at Sep. 30, 2017 196,463 $ 140,368 5,364 50,680 51
Ending balances, shares at Sep. 30, 2017   7,856,664      
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) $ 717     10,491 (9,774)
Issuance of common stock 5,093 $ 5,093      
Issuance of common stock, shares   189,074      
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 612 (612)    
Share based payment awards under equity compensation plan 449   449    
Common stock purchased for deferred compensation obligations (290) (290)      
Common stock repurchased pursuant to publicly announced repurchase plan (6,212) $ (6,212)      
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (215,427)      
Cash dividends (6,126)     (6,126)  
Ending balances at Sep. 30, 2018 $ 188,536 $ 139,480 $ 5,339 55,870 (12,153)
Ending balances, shares at Sep. 30, 2018 7,830,940 7,830,940      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption $ 0     $ (223) $ 223