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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)
Additional Paid-in Capital
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) 8,715     14,021 (5,306)  
Adoption of ASU 2016-01 0     (223) 223  
Issuance of common stock 6,864 $ 6,864        
Issuance of common stock, shares   261,693        
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        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive income (loss) 22,680     13,024 9,656  
Issuance of common stock 4,876 $ 4,876        
Issuance of common stock, shares   209,583        
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 911 (911)      
Share based payment awards under equity compensation plan 523   523      
Common stock purchased for deferred compensation obligations (1,131) (1,131)        
Common stock repurchased pursuant to publicly announced repurchase plan (4,003) $ (4,003)        
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (169,748)        
Cash dividends (8,282)     (8,282)    
Ending balances at Dec. 31, 2019 $ 210,182 $ 141,069 5,043 62,099 1,971  
Ending balances, shares at Dec. 31, 2019 7,910,804 7,910,804        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive income (loss) $ 16,612     10,885 5,727  
Issuance of common stock 4,185 $ 4,185        
Issuance of common stock, shares   231,393        
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations 0 $ 1,273 (1,273)      
Share based payment awards under equity compensation plan 413   413      
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition 14         $ 14
Common stock purchased for deferred compensation obligations (1,592) (1,592)        
Common stock repurchased pursuant to publicly announced repurchase plan (2,702) $ (2,702)        
Common stock repurchased pursuant to publicly announced repurchase plan, shares   (144,950)        
Cash dividends (8,524)     (8,524)    
Ending balances at Dec. 31, 2020 $ 218,588 $ 142,247 $ 4,183 $ 64,460 $ 7,698  
Ending balances, shares at Dec. 31, 2020 7,997,247 7,997,247