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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Accumulated Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2015 $ 453,981 $ 203 $ 204,688 $ (22,370) $ 268,873 $ 2,587
Beginning Balance, Shares at Dec. 31, 2015   20,388,396        
Treasury Stock Beginning Balance, Shares at Dec. 31, 2015       (1,258,250)    
Comprehensive income:            
Net income 77,865       77,865  
Other comprehensive income:            
Change in unrealized gains loss, net of tax (3,079)         (3,079)
Comprehensive income 74,786          
Common stock issued upon exercise of options 837 $ 1 836      
Common stock issued upon exercise of options, Shares   68,879        
Common stock issued 603   603      
Common stock issued, Shares   31,110        
Share-based compensation 1,268   1,268      
Tax benefit from share-based payments 995   995      
Dividends to shareholders (76,320)       (76,320)  
Ending Balance at Dec. 31, 2016 456,150 $ 204 208,390 $ (22,370) 270,418 (492)
Ending Balance, Shares at Dec. 31, 2016   20,488,385        
Treasury Stock Ending Balance, Shares at Dec. 31, 2016       (1,258,250)    
Comprehensive income:            
Net income 46,231       46,231  
Other comprehensive income:            
Change in unrealized gains loss, net of tax 4,104         4,104
Comprehensive income 50,335          
Common stock issued 396   396      
Common stock issued, Shares   15,780        
Share-based compensation 1,295   1,295      
Dividends to shareholders (82,753)       (82,753)  
Ending Balance at Dec. 31, 2017 $ 425,423 $ 204 210,081 $ (22,370) 233,896 3,612
Ending Balance, Shares at Dec. 31, 2017 20,504,165 20,504,165        
Treasury Stock Ending Balance, Shares at Dec. 31, 2017 (1,258,250)     (1,258,250)    
Comprehensive income:            
Impact of adoption of ASU | ASU 2016-01 [Member]         615 (615)
Impact of adoption of ASU | ASU 2018-02 [Member]         (414) 414
Net income $ 71,632       71,632  
Other comprehensive income:            
Change in unrealized gains loss, net of tax (4,243)         (4,243)
Comprehensive income 67,389          
Common stock issued upon exercise of options 67   67      
Common stock issued upon exercise of options, Shares   15,000        
Common stock issued 196 $ 1 195      
Common stock issued, Shares   9,065        
Share-based compensation 1,088   1,088      
Dividends to shareholders (84,401)       (84,401)  
Ending Balance at Dec. 31, 2018 $ 409,762 $ 205 $ 211,431 $ (22,370) $ 221,328 $ (832)
Ending Balance, Shares at Dec. 31, 2018 20,528,230 20,528,230        
Treasury Stock Ending Balance, Shares at Dec. 31, 2018 (1,258,250)     (1,258,250)