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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 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 $ 0.48 $ 0.48 $ 1.44 $ 1.44  
Net Income (Loss) Attributable to Parent $ 53,502 $ 45,496 $ 45,135 $ 46,391 $ 45,153 $ 39,795 $ 37,559 $ 144,133 $ 122,507  
Other Comprehensive Income (Loss), Net of Tax 23,667 3,504 29,348 (51,731) 72,006 1,933 (10,347) 56,519 63,592  
Accrual of dividends on common stock (16,758) (16,826) (16,814) (16,772) (16,760) (16,737) (16,713)      
Amortization of stock-based compensation related to restricted stock grants, net of shares surrendered 2,678 37 1,458 2,717 2,556 1,267 1,318      
Repurchase of common stock (15,861)                  
Equity, Attributable to Parent $ 1,912,892 $ 1,865,664 $ 1,833,453 $ 1,774,326 $ 1,793,721 $ 1,690,766 $ 1,664,508 $ 1,912,892 $ 1,793,721 $ 1,652,691
Cumulative dividends declared per common share $ 0.48 $ 0.48 $ 0.48 $ 0.48 $ 0.48 $ 0.48 $ 0.48 $ 1.44 $ 1.44  
Common Stock [Member]                    
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture 1,303 94,022 30,140 3,144 936 60,531 46,852      
Stock Repurchased and Retired During Period, Shares (250,000)                  
Shares, Outstanding 34,335,297 34,583,994 34,489,972 34,459,832 34,456,688 34,455,752 34,395,221 34,335,297 34,456,688 34,348,369
Common Stock and Paid in Capital [Member]                    
Amortization of stock-based compensation related to restricted stock grants, net of shares surrendered $ 2,678 $ 37 $ 1,458 $ 2,717 $ 2,556 $ 1,267 $ 1,318      
Repurchase of common stock (15,861)                  
Equity, Attributable to Parent 1,295,821 1,309,004 1,308,967 1,307,509 1,304,792 1,302,236 1,300,969 $ 1,295,821 $ 1,304,792 $ 1,299,651
Retained Earnings [Member]                    
Net Income (Loss) Attributable to Parent 53,502 45,496 45,135 46,391 45,153 39,795 37,559      
Accrual of dividends on common stock (16,758)                  
Equity, Attributable to Parent 837,826 801,082 772,412 744,091 714,472 686,079 663,021 837,826 714,472 642,175
Dividends, Common Stock, Cash   (16,826) (16,814) (16,772) (16,760) (16,737) (16,713)      
Accumulated Other Comprehensive Income (Loss) [Member]                    
Other Comprehensive Income (Loss), Net of Tax 23,667 3,504 29,348 (51,731) 72,006 1,933 (10,347)      
Equity, Attributable to Parent $ (220,755) $ (244,422) $ (247,926) $ (277,274) $ (225,543) $ (297,549) $ (299,482) $ (220,755) $ (225,543) $ (289,135)