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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 43,469     43,469  
Other comprehensive loss, net of tax (17,498)       (17,498)
Stock-based compensation expense 1,825   1,825    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (16,663)      
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares)   15,686      
Time based stock awards granted (in shares)   178,001      
Issuance of common stock related to employee stock purchase plan (in shares)   5,158      
Issuance of common stock related to employee stock purchase plan 139   139    
Cash dividends declared (7,932)     (7,932)  
Common stock repurchased (in shares)   (1,466)      
Common stock repurchased (62) $ 0 (62)    
Ending balance (in shares) at Mar. 31, 2021   31,960,379      
Ending balance at Mar. 31, 2021 $ 1,260,833 $ 316 428,917 833,598 (1,998)
Beginning balance (in shares) at Dec. 31, 2021 31,960,379 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 45,744     45,744  
Other comprehensive loss, net of tax (107,482)       (107,482)
Stock-based compensation expense 2,966   2,966    
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)   1,789      
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 19   19    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (62,228)      
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)   165,416      
Issuance of common stock related to employee stock purchase plan (in shares)   3,379      
Issuance of common stock related to employee stock purchase plan 197   197    
Cash dividends declared $ (12,665)     (12,665)  
Ending balance (in shares) at Mar. 31, 2022 32,079,474 32,079,474      
Ending balance at Mar. 31, 2022 $ 1,279,554 $ 318 $ 437,820 $ 963,140 $ (121,724)