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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     106      
Exercise of stock options, shares     8      
Exercise of stock options 122   $ 122      
Stock-based compensation expense 1,846   $ 1,846      
Common stock repurchased, shares     (824)      
Common stock repurchased (19,098)   $ (19,098)      
Net income 6,052     6,052    
Other comprehensive income (loss), net of tax 15,603         15,603
Cash dividends declared on common stock (14,569)     (14,569)    
Ending balance, shares at Jun. 30, 2020     35,909      
Ending balance at Jun. 30, 2020 793,652   $ 569,329 198,342   25,981
Beginning balance, shares at Mar. 31, 2020     35,889      
Beginning balance at Mar. 31, 2020 798,438   $ 568,439 211,707   18,292
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Restricted stock awards forfeited, shares     19      
Exercise of stock options, shares     3      
Exercise of stock options 51   $ 51      
Stock-based compensation expense 877   $ 877      
Common stock repurchased, shares     (2)      
Common stock repurchased (38)   $ (38)      
Net income (6,139)     (6,139)    
Other comprehensive income (loss), net of tax 7,689         7,689
Cash dividends declared on common stock (7,226)     (7,226)    
Ending balance, shares at Jun. 30, 2020     35,909      
Ending balance at Jun. 30, 2020 793,652   $ 569,329 198,342   25,981
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     120      
Stock-based compensation expense 1,796   $ 1,796      
Common stock repurchased, shares     (26)      
Common stock repurchased (757)   $ (757)      
Net income 58,046     58,046    
Other comprehensive income (loss), net of tax (8,957)         (8,957)
Cash dividends declared on common stock (14,583)     (14,583)    
Ending balance, shares at Jun. 30, 2021     36,006      
Ending balance at Jun. 30, 2021 855,984   $ 572,060 267,863   16,061
Beginning balance, shares at Mar. 31, 2021     35,981      
Beginning balance at Mar. 31, 2021 827,151   $ 571,204 242,486   13,461
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Restricted stock awards forfeited, shares     28      
Stock-based compensation expense 926   $ 926      
Common stock repurchased, shares     (3)      
Common stock repurchased (70)   $ (70)      
Net income 32,702     32,702    
Other comprehensive income (loss), net of tax 2,600         2,600
Cash dividends declared on common stock (7,325)     (7,325)    
Ending balance, shares at Jun. 30, 2021     36,006      
Ending balance at Jun. 30, 2021 $ 855,984   $ 572,060 $ 267,863   $ 16,061
[1] Effective January 1, 2020, Company adopted ASU 2016-13, Financial Instruments - Credit Losses.