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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, 2017 $ 194,905 $ 140,277 $ 5,502 $ 51,728 $ (2,602)
Beginning balances, shares at Dec. 31, 2017   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      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption 0     (223) 223
Beginning balances at Dec. 31, 2018 $ 195,519 $ 140,416 5,431 57,357 (7,685)
Beginning balances, shares at Dec. 31, 2018 7,870,969 7,870,969      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Comprehensive income (loss) $ 21,957     12,126 9,831
Issuance of common stock 3,672 $ 3,672      
Issuance of common stock, shares   159,521      
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 268 (268)    
Share based payment awards under equity compensation plan 415   415    
Common stock purchased for deferred compensation obligations (898) (898)      
Common stock repurchased pursuant to publicly announced repurchase plan (2,140) $ (2,140)      
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (92,256)      
Cash dividends (6,149)     (6,149)  
Ending balances at Sep. 30, 2019 $ 212,376 $ 141,318 $ 5,578 $ 63,334 $ 2,146
Ending balances, shares at Sep. 30, 2019 7,938,234 7,938,234