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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
AOCI
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2021   55,434,910        
Beginning balance, net of tax at Dec. 31, 2021 $ 1,319,112 $ 58 $ 1,316,984 $ 92,463 $ (23,758) $ (66,635)
Increase (decrease) in shareholders' equity            
Net income 93,924     93,924    
OCI, net of tax (265,237)       (265,237)  
Repurchase of stock (in shares)   (388,614)        
Repurchase of stock (9,912)         (9,912)
Issuance of treasury stock for ESPP (in shares)   50,033        
Issuance of treasury stock for ESPP 1,017   (271)     1,288
Net issuance of treasury stock for RSU/DSU vesting and related tax (in shares)   136,105        
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (878)   (4,383)     3,505
Cash dividends on common stock (38,159)     (38,159)    
Stock dividend equivalents on RSUs 0   870 (870)    
Stock-based compensation 6,721   6,721      
Ending balance (in shares) at Sep. 30, 2022   55,232,434        
Ending balance, net of tax at Sep. 30, 2022 1,106,588 $ 58 1,319,921 147,358 (288,995) (71,754)
Beginning balance (in shares) at Jun. 30, 2022   55,335,703        
Beginning balance, net of tax at Jun. 30, 2022 1,161,957 $ 58 1,317,675 124,685 (211,107) (69,354)
Increase (decrease) in shareholders' equity            
Net income 35,661     35,661    
OCI, net of tax (77,888)       (77,888)  
Repurchase of stock (in shares)   (130,000)        
Repurchase of stock (3,088)         (3,088)
Issuance of treasury stock for ESPP (in shares)   10,993        
Issuance of treasury stock for ESPP 206   (77)     283
Net issuance of treasury stock for RSU/DSU vesting and related tax (in shares)   15,738        
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (29)   (434)     405
Cash dividends on common stock (12,707)     (12,707)    
Stock dividend equivalents on RSUs 0   281 (281)    
Stock-based compensation 2,476   2,476      
Ending balance (in shares) at Sep. 30, 2022   55,232,434        
Ending balance, net of tax at Sep. 30, 2022 1,106,588 $ 58 1,319,921 147,358 (288,995) (71,754)
Beginning balance (in shares) at Dec. 31, 2022   55,279,124        
Beginning balance, net of tax at Dec. 31, 2022 1,145,977 $ 58 1,320,980 168,769 (273,278) (70,552)
Increase (decrease) in shareholders' equity            
Net income 96,816     96,816    
OCI, net of tax (17,452)       (17,452)  
Repurchase of stock (in shares)   (110,123)        
Repurchase of stock (2,209)         (2,209)
Issuance of treasury stock for ESPP (in shares)   51,885        
Issuance of treasury stock for ESPP 884   (451)     1,335
Net issuance of treasury stock for RSU/DSU vesting and related tax (in shares)   120,137        
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (989)   (4,083)     3,094
Net issuance of treasury stock for warrants exercised (in shares)   994        
Net issuance of treasury stock for warrants exercised 9   (17)     26
Cash dividends on common stock (39,806)     (39,806)    
Stock dividend equivalents on RSUs 0   1,081 (1,081)    
Stock-based compensation 6,928   6,928      
Ending balance (in shares) at Sep. 30, 2023   55,342,017        
Ending balance, net of tax at Sep. 30, 2023 1,190,158 $ 58 1,324,438 224,698 (290,730) (68,306)
Beginning balance (in shares) at Jun. 30, 2023   55,290,847        
Beginning balance, net of tax at Jun. 30, 2023 1,201,948 $ 58 1,325,173 207,660 (260,921) (70,022)
Increase (decrease) in shareholders' equity            
Net income 30,666     30,666    
OCI, net of tax (29,809)       (29,809)  
Repurchase of stock (in shares)   (65,123)        
Repurchase of stock (1,278)         (1,278)
Issuance of treasury stock for ESPP (in shares)   11,291        
Issuance of treasury stock for ESPP 184   (106)     290
Net issuance of treasury stock for RSU/DSU vesting and related tax (in shares)   105,002        
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (889)   (3,593)     2,704
Cash dividends on common stock (13,267)     (13,267)    
Stock dividend equivalents on RSUs 0   361 (361)    
Stock-based compensation 2,603   2,603      
Ending balance (in shares) at Sep. 30, 2023   55,342,017        
Ending balance, net of tax at Sep. 30, 2023 $ 1,190,158 $ 58 $ 1,324,438 $ 224,698 $ (290,730) $ (68,306)