v3.26.1
Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance $ 1,174,587 $ 1,162,325 $ 1,046,042 $ 715,067 $ 1,162,325 $ 715,067
Other Comprehensive Income (Loss) Before Reclassification 9,572   2,121   (235) 12,904
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0   0   0 0
Total Other Comprehensive Income (Loss) 9,572 (9,807) 2,121 10,783 (235) 12,904
Ending balance 1,211,560 1,174,587 1,069,504 1,046,042 1,211,560 1,069,504
Total            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance (174,741) (164,934) (209,681) (220,464) (164,934) (220,464)
Total Other Comprehensive Income (Loss) 9,572 (9,807) 2,121 10,783    
Ending balance (165,169) (174,741) (207,560) (209,681) (165,169) (207,560)
Unrealized Gains and Losses on Available-for-Sale Securities            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance (174,227) (164,420) (209,167) (219,950) (164,420) (219,950)
Other Comprehensive Income (Loss) Before Reclassification 9,572   2,121   (235) 12,904
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0   0   0 0
Total Other Comprehensive Income (Loss) 9,572   2,121   (235) 12,904
Ending balance (164,655) (174,227) (207,046) (209,167) (164,655) (207,046)
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 (Loss) 0   0   0 0
Ending balance $ (514) $ (514) $ (514) $ (514) $ (514) $ (514)