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Consolidated Statements of Changes in Shareholders' Equity - (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2020   31,779,663      
Beginning balance at Dec. 31, 2020 $ 1,240,892 $ 315 $ 427,016 $ 798,061 $ 15,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income 91,462     91,462  
Other comprehensive loss, net of tax (10,980)       (10,980)
Stock-based compensation expense 3,823   3,823    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (20,999)      
Vesting of time-based stock awards issued at date of grant, net of shares withheld for payroll taxes 0 $ 1 (1)    
Vesting of performance-based stock awards, net of shares withheld for payroll taxes (in shares)   15,686      
Time based stock awards granted (in shares)   178,922      
Issuance of common stock related to employee stock purchase plan (in shares)   9,767      
Issuance of common stock related to employee stock purchase plan 327   327    
Cash dividends declared (19,126)     (19,126)  
Common stock repurchased (in shares)   (1,466)      
Common stock repurchased (62) $ 0 (62)    
Ending balance (in shares) at Jun. 30, 2021   31,961,573      
Ending balance at Jun. 30, 2021 1,306,336 $ 316 431,103 870,397 4,520
Beginning balance (in shares) at Mar. 31, 2021   31,960,379      
Beginning balance at Mar. 31, 2021 1,260,833 $ 316 428,917 833,598 (1,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income 47,993     47,993  
Other comprehensive loss, net of tax 6,518       6,518
Stock-based compensation expense 1,998   1,998    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (4,336)      
Time based stock awards granted (in shares)   921      
Issuance of common stock related to employee stock purchase plan (in shares)   4,609      
Issuance of common stock related to employee stock purchase plan 188   188    
Cash dividends declared (11,194)     (11,194)  
Ending balance (in shares) at Jun. 30, 2021   31,961,573      
Ending balance at Jun. 30, 2021 $ 1,306,336 $ 316 431,103 870,397 4,520
Beginning balance (in shares) at Dec. 31, 2021 31,950,092 31,950,092      
Beginning balance at Dec. 31, 2021 $ 1,350,775 $ 316 434,640 930,061 (14,242)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income 61,440     61,440  
Other comprehensive loss, net of tax (138,127)       (138,127)
Stock-based compensation expense 5,314   5,314    
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)   3,289      
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 97   97    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (66,038)      
Vesting of time-based stock awards issued at date of grant, net of shares withheld for payroll taxes 0 $ 2 (2)    
Vesting of performance-based stock awards, net of shares withheld for payroll taxes (in shares)   21,026      
Time based stock awards granted (in shares)   166,471      
Issuance of common stock related to employee stock purchase plan (in shares)   6,401      
Issuance of common stock related to employee stock purchase plan 369   369    
Cash dividends declared $ (27,148)     (27,148)  
Ending balance (in shares) at Jun. 30, 2022 32,081,241 32,081,241      
Ending balance at Jun. 30, 2022 $ 1,252,720 $ 318 440,418 964,353 (152,369)
Beginning balance (in shares) at Mar. 31, 2022   32,079,474      
Beginning balance at Mar. 31, 2022 1,279,554 $ 318 437,820 963,140 (121,724)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income 15,696     15,696  
Other comprehensive loss, net of tax (30,645)       (30,645)
Stock-based compensation expense 2,349   2,349    
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)   1,500      
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 77   77    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (3,810)      
Vesting of time-based stock awards issued at date of grant, net of shares withheld for payroll taxes 0 $ 0 0    
Time based stock awards granted (in shares)   1,055      
Issuance of common stock related to employee stock purchase plan (in shares)   3,022      
Issuance of common stock related to employee stock purchase plan 172   172    
Cash dividends declared $ (14,483)     (14,483)  
Ending balance (in shares) at Jun. 30, 2022 32,081,241 32,081,241      
Ending balance at Jun. 30, 2022 $ 1,252,720 $ 318 $ 440,418 $ 964,353 $ (152,369)