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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2022
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 $ 45,153 $ 39,795 $ 37,559 $ 42,624 $ 45,854 $ 39,591 $ 55,555 $ 122,507 $ 141,000  
Other Comprehensive Income (Loss), Net of Tax 72,006 1,933 (10,347) 103,780 (53,467) (13,812) 37,133 63,592 (30,146)  
Accrual of dividends on common stock (16,760) (16,737) (16,713) (16,664) (16,666) (16,670) (16,691)      
Amortization of stock-based compensation related to restricted stock grants, net of shares surrendered 2,556 1,267 1,318 2,344 2,373 1,709 (734)      
Equity, Attributable to Parent $ 1,793,721 $ 1,690,766 $ 1,664,508 $ 1,652,691 $ 1,520,607 $ 1,542,513 $ 1,531,695 $ 1,793,721 $ 1,520,607 $ 1,456,432
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 936 60,531 46,852 2,420 1,322 36,087 114,522      
Shares, Outstanding 34,456,688 34,455,752 34,395,221 34,348,369 34,345,949 34,344,627 34,308,540 34,456,688 34,345,949 34,194,018
Common Stock and Paid in Capital [Member]                    
Amortization of stock-based compensation related to restricted stock grants, net of shares surrendered $ 2,556 $ 1,267 $ 1,318 $ 2,344 $ 2,373 $ 1,709 $ (734)      
Equity, Attributable to Parent 1,304,792 1,302,236 1,300,969 1,299,651 1,297,307 1,294,934 1,293,225 $ 1,304,792 $ 1,297,307 $ 1,293,959
Retained Earnings [Member]                    
Net Income (Loss) Attributable to Parent 45,153 39,795 37,559 42,624 45,854 39,591 55,555      
Accrual of dividends on common stock (16,760)                  
Equity, Attributable to Parent 714,472 686,079 663,021 642,175 616,215 587,027 564,106 714,472 616,215 525,242
Dividends, Common Stock, Cash   (16,737) (16,713) (16,664) (16,666) (16,670) (16,691)      
Accumulated Other Comprehensive Income (Loss) [Member]                    
Other Comprehensive Income (Loss), Net of Tax 72,006 1,933 (10,347) 103,780 (53,467) (13,812) 37,133      
Equity, Attributable to Parent $ (225,543) $ (297,549) $ (299,482) $ (289,135) $ (392,915) $ (339,448) $ (325,636) $ (225,543) $ (392,915) $ (362,769)