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Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance $ 1,069,504 $ 1,046,042 $ 715,067 $ 687,821 $ 655,254 $ 663,558 $ 715,067 $ 663,558
Other Comprehensive Income (Loss) Before Reclassification 25,180     42,775     38,084 14,914
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0     55     0 27,107
Total Other Comprehensive Income 25,180 2,121 10,783 42,830 19,086 (19,895) 38,084 42,021
Ending balance 1,119,723 1,069,504 1,046,042 744,563 687,821 655,254 1,119,723 744,563
Total                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance (207,560) (209,681) (220,464) (217,869) (236,955) (217,060) (220,464) (217,060)
Total Other Comprehensive Income 25,180 2,121 10,783 42,830 19,086 (19,895)    
Ending balance (182,380) (207,560) (209,681) (175,039) (217,869) (236,955) (182,380) (175,039)
Unrealized Gains and Losses on Available-for-Sale Securities                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance (207,046)   (219,950) (217,355)   (216,546) (219,950) (216,546)
Other Comprehensive Income (Loss) Before Reclassification 25,180     42,775     38,084 14,914
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0     55     0 27,107
Total Other Comprehensive Income 25,180     42,830     38,084 42,021
Ending balance (181,866) (207,046)   (174,525) (217,355)   (181,866) (174,525)
Postretirement Benefit Items                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance (514)   $ (514) (514)   $ (514) (514) (514)
Other Comprehensive Income (Loss) Before Reclassification 0     0     0 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0     0     0 0
Total Other Comprehensive Income 0     0     0 0
Ending balance $ (514) $ (514)   $ (514) $ (514)   $ (514) $ (514)