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Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - 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, 2017 $ 425,423 $ 204 $ 210,081 $ (22,370) $ 233,896 $ 3,612
Beginning Balance, Shares at Dec. 31, 2017   20,504,165   (1,258,250)    
Comprehensive income:            
Impact of adoption of ASU | ASU 2016-01 [Member] 614       614  
Impact of adoption of ASU | ASU 2018-02 [Member] (414)       (414)  
Net income 52,826       52,826  
Other comprehensive income:            
Change in unrealized gains (losses), net of tax (7,813)         (7,813)
Comprehensive income 45,013          
Common stock issued upon exercise of options $ 67   67      
Common stock issued upon exercise of options, Shares 15,000 15,000        
Common stock issued $ 196 $ 1 195      
Common stock issued, Shares   9,065        
Share-based compensation 813   813      
Dividends to shareholders (12,716)       (12,716)  
Ending Balance at Sep. 30, 2018 458,996 $ 205 211,156 $ (22,370) 274,206 (4,201)
Ending Balance, Shares at Sep. 30, 2018   20,528,230   (1,258,250)    
Beginning Balance at Jun. 30, 2018 445,391 $ 205 210,895 $ (22,370) 258,744 (2,083)
Beginning Balance, Shares at Jun. 30, 2018   20,528,230   (1,258,250)    
Comprehensive income:            
Net income 19,701       19,701  
Other comprehensive income:            
Change in unrealized gains (losses), net of tax (2,118)         (2,118)
Comprehensive income 17,583          
Share-based compensation 261   261      
Dividends to shareholders (4,239)       (4,239)  
Ending Balance at Sep. 30, 2018 458,996 $ 205 211,156 $ (22,370) 274,206 (4,201)
Ending Balance, Shares at Sep. 30, 2018   20,528,230   (1,258,250)    
Beginning Balance at Dec. 31, 2018 $ 409,762 $ 205 211,431 $ (22,370) 221,328 (832)
Beginning Balance, Shares at Dec. 31, 2018 19,269,980 20,528,230   (1,258,250)    
Comprehensive income:            
Impact of adoption of ASU | ASU 2016-02 [Member] $ (1)       (1)  
Net income 58,676       58,676  
Other comprehensive income:            
Change in unrealized gains (losses), net of tax 13,447         13,447
Comprehensive income 72,123          
Common stock issued upon exercise of options $ 20   20      
Common stock issued upon exercise of options, Shares 5,000 5,000        
Common stock issued $ 559   559      
Common stock issued, Shares   25,329        
Share-based compensation 733   733      
Dividends to shareholders (14,467)       (14,467)  
Ending Balance at Sep. 30, 2019 $ 468,729 $ 205 212,743 $ (22,370) 265,536 12,615
Ending Balance, Shares at Sep. 30, 2019 19,300,309 20,558,559   (1,258,250)    
Beginning Balance at Jun. 30, 2019 $ 449,443 $ 205 212,493 $ (22,370) 248,975 10,140
Beginning Balance, Shares at Jun. 30, 2019   20,556,511   (1,258,250)    
Comprehensive income:            
Net income 21,386       21,386  
Other comprehensive income:            
Change in unrealized gains (losses), net of tax 2,475         2,475
Comprehensive income 23,861          
Common stock issued (1)   (1)      
Common stock issued, Shares   2,048        
Share-based compensation 251   251      
Dividends to shareholders (4,825)       (4,825)  
Ending Balance at Sep. 30, 2019 $ 468,729 $ 205 $ 212,743 $ (22,370) $ 265,536 $ 12,615
Ending Balance, Shares at Sep. 30, 2019 19,300,309 20,558,559   (1,258,250)