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Accumulated Other Comprehensive Income Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance $ 15,945    
Cumulative effect adjustment for adoption of new accounting standards     $ 0
Other comprehensive income before reclassifications (1,309) $ 1,097  
Amounts reclassified from accumulated other comprehensive income 0 (57)  
Other comprehensive (loss) income (1,309) 1,040  
Ending balance 1,009    
Unrealized Gains and Losses On Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance 16,003 11,870  
Cumulative effect adjustment for adoption of new accounting standards     (13,616)
Other comprehensive income before reclassifications (1,309) 1,097  
Amounts reclassified from accumulated other comprehensive income 0 (58)  
Other comprehensive (loss) income (1,309) 1,039  
Ending balance 1,078 12,909  
Postretirement Benefits Plans      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (58) (109)  
Cumulative effect adjustment for adoption of new accounting standards     (11)
Other comprehensive income before reclassifications 0 0  
Amounts reclassified from accumulated other comprehensive income 0 1  
Other comprehensive (loss) income 0 1  
Ending balance (69) (108)  
Accumulated Other Comprehensive Income      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance 15,945 11,761  
Cumulative effect adjustment for adoption of new accounting standards     $ (13,627)
Ending balance $ 1,009 $ 12,801