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Other Comprehensive Income (Loss) (Schedule of Other Comprehensive Income Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ 573,820 $ 458,640 $ 364,571
Other Comprehensive Income (Loss) Before Reclassification 23,494 23,162  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (3,224) (959)  
Comprehensive Income (Loss) 20,270 22,203 (4,478)
Ending Balance 624,709 573,820 458,640
Unrealized Gains and Losses on Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 15,673 (6,759)  
Other Comprehensive Income (Loss) Before Reclassification 23,494 23,418  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (3,224) (986)  
Comprehensive Income (Loss) 20,270 22,432  
Ending Balance 35,943 15,673 (6,759)
Postretirement Benefit Items      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (568) (339)  
Other Comprehensive Income (Loss) Before Reclassification 0 (256)  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 27  
Comprehensive Income (Loss) 0 (229)  
Ending Balance (568) (568) (339)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 15,105 (7,098) (2,620)
Comprehensive Income (Loss) 20,270 22,203 (4,478)
Ending Balance $ 35,375 $ 15,105 $ (7,098)