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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common stock amount
Additional paid-in capital
Retained earnings
Accumulated other comprehensive income (loss)
Treasury stock
Balance at beginning of period at Dec. 31, 2017 $ 354,641 $ 32,857 $ 186,702 $ 144,977 $ (4,554) $ (5,341)
Increase (Decrease) in Stockholders' Equity            
Net income 16,347     16,347    
Other comprehensive income (loss) (9,813)       (9,813)  
Cash dividends declared (5,981)     (5,981)    
Treasury stock purchased (278)         (278)
Net issuance to employee stock plans, including related tax effects 604   (131)     735
Recognition of stock based compensation 627   627      
Balance at end of period at Jun. 30, 2018 355,963 32,857 187,198 156,139 (15,347) (4,884)
Balance at beginning of period at Dec. 31, 2017 354,641 32,857 186,702 144,977 (4,554) (5,341)
Increase (Decrease) in Stockholders' Equity            
Net income 25,317          
Other comprehensive income (loss) (14,154)          
Balance at end of period at Sep. 30, 2018 357,685 32,857 187,284 162,008 (19,688) (4,776)
Balance at beginning of period at Jun. 30, 2018 355,963 32,857 187,198 156,139 (15,347) (4,884)
Increase (Decrease) in Stockholders' Equity            
Net income 8,970     8,970    
Other comprehensive income (loss) (4,341)       (4,341)  
Cash dividends declared (3,101)     (3,101)    
Treasury stock purchased (46)         (46)
Net issuance to employee stock plans, including related tax effects 31   (123)     154
Recognition of stock based compensation 209   209      
Balance at end of period at Sep. 30, 2018 357,685 32,857 187,284 162,008 (19,688) (4,776)
Balance at beginning of period at Dec. 31, 2018 370,579 32,857 187,653 166,526 (11,802) (4,655)
Increase (Decrease) in Stockholders' Equity            
Net income 13,398     13,398    
Other comprehensive income (loss) 12,679       12,679  
Cash dividends declared (6,524)     (6,524)    
Net issuance to employee stock plans, including related tax effects 80   (69)     149
Recognition of stock based compensation 560   560      
Balance at end of period at Jun. 30, 2019 390,562 32,857 188,144 173,400 877 (4,716)
Balance at beginning of period at Dec. 31, 2018 370,579 32,857 187,653 166,526 (11,802) (4,655)
Increase (Decrease) in Stockholders' Equity            
Net income 18,413          
Other comprehensive income (loss) 14,847          
Treasury stock purchased (210)         (210)
Balance at end of period at Sep. 30, 2019 394,459 32,857 188,283 174,994 3,045 (4,720)
Balance at beginning of period at Jun. 30, 2019 390,562 32,857 188,144 173,400 877 (4,716)
Increase (Decrease) in Stockholders' Equity            
Net income 5,015     5,015    
Other comprehensive income (loss) 2,168       2,168  
Cash dividends declared (3,421)     (3,421)    
Treasury stock purchased (136)         (136)
Net issuance to employee stock plans, including related tax effects 115   (17)     132
Recognition of stock based compensation 156   156      
Balance at end of period at Sep. 30, 2019 $ 394,459 $ 32,857 $ 188,283 $ 174,994 $ 3,045 $ (4,720)