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Consolidated Statements of Changes in Shareholders' Equity - 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, 2015 $ 183,971 $ 139,198 $ 4,592 $ 39,960 $ 221
Beginning balances, shares at Dec. 31, 2015   7,799,867      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Comprehensive income (loss) 10,800     13,799 (2,999)
Issuance of common stock 5,023 $ 5,023      
Issuance of common stock, shares   179,903      
Common stock issued for deferred compensation obligations 0 $ 0 0    
Common stock issued for deferred compensation obligations, shares   0      
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 127 (127)    
Share based payment awards under equity compensation plan 573   573    
Common stock purchased for deferred compensation obligations (383) (383)      
Common stock repurchased pursuant to publicly announced repurchase plan (4,440) $ (4,440)      
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (158,701)      
Cash dividends (7,645)     (7,645)  
Ending balances at Dec. 31, 2016 187,899 $ 139,525 5,038 46,114 (2,778)
Ending balances, shares at Dec. 31, 2016   7,821,069      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Comprehensive income (loss) 13,780     13,237 543
Tax Cuts and Jobs Act Reclassification to Retained Earnings (367)     367 (367)
Issuance of common stock 6,177 $ 6,177      
Issuance of common stock, shares   220,510      
Common stock issued for deferred compensation obligations 0 $ 0 0    
Common stock issued for deferred compensation obligations, shares   0      
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 176 (176)    
Share based payment awards under equity compensation plan 640   640    
Common stock purchased for deferred compensation obligations (420) (420)      
Common stock repurchased pursuant to publicly announced repurchase plan (5,181) $ (5,181)      
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (184,286)      
Cash dividends (7,990)     (7,990)  
Ending balances at Dec. 31, 2017 $ 194,905 $ 140,277 5,502 51,728 (2,602)
Ending balances, shares at Dec. 31, 2017 7,857,293 7,857,293      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Comprehensive income (loss) $ 8,715     14,021 (5,306)
Issuance of common stock 6,864 $ 6,864      
Issuance of common stock, shares   261,693      
Common stock issued for deferred compensation obligations 0 $ 0 0    
Common stock issued for deferred compensation obligations, shares   0      
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 683 (683)    
Share based payment awards under equity compensation plan 612   612    
Common stock purchased for deferred compensation obligations (401) (401)      
Common stock repurchased pursuant to publicly announced repurchase plan (7,007) $ (7,007)      
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (248,017)      
Cash dividends (8,169)     (8,169)  
Ending balances at Dec. 31, 2018 $ 195,519 $ 140,416 $ 5,431 57,357 (7,685)
Ending balances, shares at Dec. 31, 2018 7,870,969 7,870,969      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption $ 0     $ (223) $ 223