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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]            
Common Stock, Dividends, Per Share, Declared $ 0.48 $ 0.44 $ 0.44 $ 0.44 $ 0.44  
Net Income (Loss) Attributable to Parent $ 55,555 $ 54,380 $ 49,070 $ 47,965 $ 43,963  
Other Comprehensive Income (Loss), Net of Tax 37,133 6,421 (113,275) (101,824) (154,275)  
Accrual of dividends on common stock (16,691) (15,246) (15,208) (15,378) (15,066)  
Amortization of stock-based compensation related to restricted stock grants, net of shares surrendered (734) 2,218 2,242 2,247 (1,169)  
Repurchase of common stock       (10,960)    
Equity, Attributable to Parent $ 1,531,695 $ 1,456,432 $ 1,408,659 $ 1,485,830 $ 1,563,780 $ 1,690,327
Common Stock, Dividends, Per Share, Declared $ 0.48 $ 0.44 $ 0.44 $ 0.44 $ 0.44  
Common Stock [Member]            
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture 114,522 2,259 429 18,546 120,152  
Stock Repurchased and Retired During Period, Shares       (200,000)    
Shares, Outstanding 34,308,540 34,194,018 34,191,759 34,191,330 34,372,784 34,252,632
Common Stock and Paid in Capital [Member]            
Amortization of stock-based compensation related to restricted stock grants, net of shares surrendered $ (734) $ 2,218 $ 2,242 $ 2,247 $ (1,169)  
Repurchase of common stock       (10,960)    
Equity, Attributable to Parent 1,293,225 1,293,959 1,291,741 1,289,499 1,298,212 $ 1,299,381
Retained Earnings [Member]            
Net Income (Loss) Attributable to Parent 55,555 54,380 49,070 47,965 43,963  
Accrual of dividends on common stock (16,691) (15,246) (15,208) (15,378) (15,066)  
Equity, Attributable to Parent 564,106 525,242 486,108 452,246 419,659 390,762
Accumulated Other Comprehensive Income (Loss) [Member]            
Other Comprehensive Income (Loss), Net of Tax 37,133 6,421 (113,275) (101,824) (154,275)  
Equity, Attributable to Parent $ (325,636) $ (362,769) $ (369,190) $ (255,915) $ (154,091) $ 184