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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
 [1]
Common stock
Retained earnings
Retained earnings
Cumulative Effect, Period of Adoption, Adjustment
 [1]
Accumulated other comprehensive income (loss), net
Beginning balance, shares at Dec. 31, 2019     36,619      
Beginning balance at Dec. 31, 2019 $ 809,311 $ (5,615) $ 586,459 $ 212,474 $ (5,615) $ 10,378
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Restricted stock awards forfeited, shares     108      
Exercise of stock options, shares     8      
Exercise of stock options 122   $ 122      
Stock-based compensation expense 2,694   $ 2,694      
Common stock repurchased, shares     (825)      
Common stock repurchased (19,105)   $ (19,105)      
Net income 22,688     22,688    
Other comprehensive income (loss), net of tax 14,830         14,830
Cash dividends declared on common stock (21,796)     (21,796)    
Ending balance, shares at Sep. 30, 2020     35,910      
Ending balance at Sep. 30, 2020 803,129   $ 570,170 207,751   25,208
Beginning balance, shares at Jun. 30, 2020     35,909      
Beginning balance at Jun. 30, 2020 793,652   $ 569,329 198,342   25,981
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Restricted stock awards forfeited, shares     2      
Stock-based compensation expense 848   $ 848      
Common stock repurchased, shares     (1)      
Common stock repurchased (7)   $ (7)      
Net income 16,636     16,636    
Other comprehensive income (loss), net of tax (773)         (773)
Cash dividends declared on common stock (7,227)     (7,227)    
Ending balance, shares at Sep. 30, 2020     35,910      
Ending balance at Sep. 30, 2020 803,129   $ 570,170 207,751   25,208
Beginning balance, shares at Dec. 31, 2020     35,912      
Beginning balance at Dec. 31, 2020 820,439   $ 571,021 224,400   25,018
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Restricted stock awards forfeited, shares     122      
Stock-based compensation expense 2,762   $ 2,762      
Common stock repurchased, shares     (867)      
Common stock repurchased (21,398)   $ (21,398)      
Net income 78,638     78,638    
Other comprehensive income (loss), net of tax (10,284)         (10,284)
Cash dividends declared on common stock (21,753)     (21,753)    
Ending balance, shares at Sep. 30, 2021     35,167      
Ending balance at Sep. 30, 2021 848,404   $ 552,385 281,285   14,734
Beginning balance, shares at Jun. 30, 2021     36,006      
Beginning balance at Jun. 30, 2021 855,984   $ 572,060 267,863   16,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Restricted stock awards forfeited, shares     2      
Stock-based compensation expense 966   $ 966      
Common stock repurchased, shares     (841)      
Common stock repurchased (20,641)   $ (20,641)      
Net income 20,592     20,592    
Other comprehensive income (loss), net of tax (1,327)         (1,327)
Cash dividends declared on common stock (7,170)     (7,170)    
Ending balance, shares at Sep. 30, 2021     35,167      
Ending balance at Sep. 30, 2021 $ 848,404   $ 552,385 $ 281,285   $ 14,734
[1] Effective January 1, 2020, Company adopted ASU 2016-13, Financial Instruments - Credit Losses.