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Other Comprehensive Income (Loss) (Other Comprehensive Income Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ 558,393 $ 668,459 $ 624,709
Other Comprehensive Income (Loss) Before Reclassification 46,410 (278,532)  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (32) (390)  
Total Other Comprehensive Income (Loss) 46,378 (278,922) (19,891)
Ending balance 663,558 558,393 668,459
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (263,438) 15,484 35,375
Total Other Comprehensive Income (Loss) 46,378 (278,922) (19,891)
Ending balance (217,060) (263,438) 15,484
Unrealized Gains and Losses on Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (262,924) 16,052  
Other Comprehensive Income (Loss) Before Reclassification 46,410 (278,532)  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (32) (444)  
Total Other Comprehensive Income (Loss) 46,378 (278,976)  
Ending balance (216,546) (262,924) 16,052
Postretirement Benefit Items      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (514) (568)  
Other Comprehensive Income (Loss) Before Reclassification 0 0  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 54  
Total Other Comprehensive Income (Loss) 0 54  
Ending balance $ (514) $ (514) $ (568)