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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Statement of Stockholders' Equity [Abstract]            
Cumulative dividends declared per common share $ 0.48 $ 0.48 $ 0.48 $ 0.48 $ 0.48  
Net Income (Loss) Attributable to Parent $ 45,135 $ 46,391 $ 45,153 $ 39,795 $ 37,559  
Other Comprehensive Income (Loss), Net of Tax 29,348 (51,731) 72,006 1,933 (10,347)  
Accrual of dividends on common stock (16,814) (16,772) (16,760) (16,737) (16,713)  
Amortization of stock-based compensation related to restricted stock grants, net of shares surrendered 1,458 2,717 2,556 1,267 1,318  
Equity, Attributable to Parent $ 1,833,453 $ 1,774,326 $ 1,793,721 $ 1,690,766 $ 1,664,508 $ 1,652,691
Cumulative dividends declared per common share $ 0.48 $ 0.48 $ 0.48 $ 0.48 $ 0.48  
Common Stock [Member]            
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture 30,140 3,144 936 60,531 46,852  
Shares, Outstanding 34,489,972 34,459,832 34,456,688 34,455,752 34,395,221 34,348,369
Common Stock and Paid in Capital [Member]            
Amortization of stock-based compensation related to restricted stock grants, net of shares surrendered $ 1,458 $ 2,717 $ 2,556 $ 1,267 $ 1,318  
Equity, Attributable to Parent 1,308,967 1,307,509 1,304,792 1,302,236 1,300,969 $ 1,299,651
Retained Earnings [Member]            
Net Income (Loss) Attributable to Parent 45,135 46,391 45,153 39,795 37,559  
Equity, Attributable to Parent 772,412 744,091 714,472 686,079 663,021 642,175
Dividends, Common Stock, Cash (16,814) (16,772) (16,760) (16,737) (16,713)  
Accumulated Other Comprehensive Income (Loss) [Member]            
Other Comprehensive Income (Loss), Net of Tax 29,348 (51,731) 72,006 1,933 (10,347)  
Equity, Attributable to Parent $ (247,926) $ (277,274) $ (225,543) $ (297,549) $ (299,482) $ (289,135)