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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Retained earnings
Accumulated other comprehensive income (loss)
Treasury stock
Cumulative Effect, Period of Adoption, Adjustment [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest           $ (56,882) $ (56,882)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | Accounting Standards Update 2016-01 [Member]            
Beginning Balances (in shares) at Dec. 31, 2019   104,281,794     (5,790,796)    
Beginning Balances at Dec. 31, 2019 $ 2,247,705 $ 1,640,771 $ 711,249 13,323 $ (117,638)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 107,498   107,498        
Other comprehensive income (loss) 28,943     28,943      
Cash dividends declared :              
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020 (67,381)   (67,381)        
Treasury Stock, Shares, Acquired         (880,000)    
Treasury Stock, Value, Acquired, Cost Method (16,686)       $ (16,686)    
Exercise of stock options, net of shares purchased (in shares)         10,405    
Exercise of stock options, net of shares purchased (72) (140)     $ (212)    
Restricted stock awards, net of forfeitures (in shares)         378,360    
Restricted stock awards, net of forfeitures (1,203) (8,891)     $ 7,688    
Share-based compensation expense 5,749 $ 5,749          
Ending Balances (in shares) at Sep. 30, 2020   104,281,794     (6,282,031)    
Ending Balances at Sep. 30, 2020 2,247,815 $ 1,637,489 694,484 42,266 $ (126,424)    
Beginning Balances (in shares) at Jun. 30, 2020   104,281,794     (6,262,936)    
Beginning Balances at Jun. 30, 2020 2,221,019 $ 1,635,070 675,532 36,431 $ (126,014)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 41,477   41,477        
Other comprehensive income (loss) 5,835     5,835      
Cash dividends declared :              
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020 (22,525)   (22,525)        
Restricted stock awards, net of forfeitures (in shares)         (19,095)    
Restricted stock awards, net of forfeitures (7) 403     $ (410)    
Share-based compensation expense 2,016 $ 2,016          
Ending Balances (in shares) at Sep. 30, 2020   104,281,794     (6,282,031)    
Ending Balances at Sep. 30, 2020 2,247,815 $ 1,637,489 694,484 42,266 $ (126,424)    
Retained Earnings (Accumulated Deficit) 720,429            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest             $ (56,900)
Beginning Balances (in shares) at Dec. 31, 2020   104,281,794     (6,259,865)    
Beginning Balances at Dec. 31, 2020 2,282,070 $ 1,638,947 720,429 48,664 $ (125,970)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 158,215   158,215        
Other comprehensive income (loss) (34,434)     (34,434)      
Cash dividends declared :              
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020 (66,562)   (66,562)        
Treasury Stock, Shares, Acquired         (4,633,355)    
Treasury Stock, Value, Acquired, Cost Method (108,077)       $ (108,077)    
Exercise of stock options, net of shares purchased (in shares)         3,468    
Exercise of stock options, net of shares purchased (34) (36)     $ (70)    
Restricted stock awards, net of forfeitures (in shares)         350,755    
Restricted stock awards, net of forfeitures (2,644) (9,414)     $ 6,770    
Share-based compensation expense 7,568 $ 7,568          
Ending Balances (in shares) at Sep. 30, 2021   104,281,794     (10,538,997)    
Ending Balances at Sep. 30, 2021 2,236,170 $ 1,637,065 812,082 14,230 $ (227,207)    
Beginning Balances (in shares) at Jun. 30, 2021   104,281,794     (8,082,285)    
Beginning Balances at Jun. 30, 2021 2,269,507 $ 1,635,470 773,857 30,735 $ (170,555)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 60,012   60,012        
Other comprehensive income (loss) (16,505)     (16,505)      
Cash dividends declared :              
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020 (21,787)   (21,787)        
Treasury Stock, Shares, Acquired         (2,484,295)    
Treasury Stock, Value, Acquired, Cost Method (57,231)       $ (57,231)    
Restricted stock awards, net of forfeitures (in shares)         27,583    
Restricted stock awards, net of forfeitures (59) (638)     $ 579    
Share-based compensation expense 2,233 $ 2,233          
Ending Balances (in shares) at Sep. 30, 2021   104,281,794     (10,538,997)    
Ending Balances at Sep. 30, 2021 2,236,170 $ 1,637,065 $ 812,082 $ 14,230 $ (227,207)    
Retained Earnings (Accumulated Deficit) $ 812,082