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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common stock
Retained earnings
Accumulated other comprehensive income (loss), net
Beginning balance, shares at Dec. 31, 2017   29,928    
Beginning balance at Dec. 31, 2017 $ 508,305 $ 360,590 $ 149,013 $ (1,298)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock awards forfeited, shares   30    
Restricted stock units vested, net of forfeitures of restricted stock awards 0      
Exercise of stock options, shares   3    
Exercise of stock options 47 $ 47    
Stock-based compensation expense 1,307 $ 1,307    
Common stock repurchased, shares   (52)    
Common stock repurchased (1,688) $ (1,688)    
Net income 20,944   20,944  
Other comprehensive income (loss), net of tax (9,915)     (9,915)
Common stock issued in business combinations, shares   4,112    
Common stock issued in business combinations 130,770 $ 130,770    
Cash dividends declared on common stock (10,247)   (10,247)  
Ending balance, shares at Jun. 30, 2018   34,021    
Ending balance at Jun. 30, 2018 639,523 $ 491,026 159,803 (11,306)
Beginning balance, shares at Mar. 31, 2018   34,018    
Beginning balance at Mar. 31, 2018 634,708 $ 490,566 153,076 (8,934)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock awards forfeited, shares   8    
Restricted stock units vested, net of forfeitures of restricted stock awards 0      
Exercise of stock options, shares   2    
Exercise of stock options 26 $ 26    
Stock-based compensation expense 684 $ 684    
Common stock repurchased, shares   (7)    
Common stock repurchased (250) $ (250)    
Net income 11,857   11,857  
Other comprehensive income (loss), net of tax (2,372)     (2,372)
Cash dividends declared on common stock (5,130)   (5,130)  
Ending balance, shares at Jun. 30, 2018   34,021    
Ending balance at Jun. 30, 2018 639,523 $ 491,026 159,803 (11,306)
Beginning balance, shares at Dec. 31, 2018   36,874    
Beginning balance at Dec. 31, 2018 760,723 $ 591,806 176,372 (7,455)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock awards forfeited, shares   62    
Restricted stock units vested, net of forfeitures of restricted stock awards 0      
Exercise of stock options, shares   3    
Exercise of stock options 42 $ 42    
Stock-based compensation expense 1,536 $ 1,536    
Common stock repurchased, shares   (56)    
Common stock repurchased (1,681) $ (1,681)    
Net income 32,536   32,536  
Other comprehensive income (loss), net of tax 17,209     17,209
Common stock issued in business combinations 0      
Cash dividends declared on common stock (13,341)   (13,341)  
Ending balance, shares at Jun. 30, 2019   36,883    
Ending balance at Jun. 30, 2019 796,625 $ 591,703 195,168 9,754
Beginning balance, shares at Mar. 31, 2019   36,899    
Beginning balance at Mar. 31, 2019 778,191 $ 591,767 185,863 561
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock awards forfeited, shares   13    
Restricted stock units vested, net of forfeitures of restricted stock awards 0      
Exercise of stock options, shares   1    
Exercise of stock options 20 $ 20    
Stock-based compensation expense 795 $ 795    
Common stock repurchased, shares   (30)    
Common stock repurchased (879) $ (879)    
Net income 15,984   15,984  
Other comprehensive income (loss), net of tax 9,193     9,193
Cash dividends declared on common stock (6,679)   (6,679)  
Ending balance, shares at Jun. 30, 2019   36,883    
Ending balance at Jun. 30, 2019 $ 796,625 $ 591,703 $ 195,168 $ 9,754