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Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 715,067 $ 663,558
Other Comprehensive Income (Loss) Before Reclassification 10,783 (19,867)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 (28)
Total Other Comprehensive Income (Loss) 10,783 (19,895)
Ending balance 1,046,042 655,254
Total    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (220,464) (217,060)
Total Other Comprehensive Income (Loss) 10,783 (19,895)
Ending balance (209,681) (236,955)
Unrealized Gains and Losses on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (219,950) (216,546)
Other Comprehensive Income (Loss) Before Reclassification 10,783 (19,867)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 (28)
Total Other Comprehensive Income (Loss) 10,783 (19,895)
Ending balance (209,167) (236,441)
Postretirement Benefit Items    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (514) (514)
Other Comprehensive Income (Loss) Before Reclassification 0 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 0
Total Other Comprehensive Income (Loss) 0 0
Ending balance $ (514) $ (514)