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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     $ 4,326  
Other comprehensive income (loss) $ 89 $ 1,118 (521) $ 1,130
Ending balance 3,805   3,805  
Unrealized Gains and Losses On Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 3,860 3,176 4,470 3,132
Other comprehensive income before reclassifications 47 1,118 (545) 814
Amounts reclassified from accumulated other comprehensive income 42 0 24 348
Other comprehensive income (loss) 89 1,118 (521) 1,162
Ending balance 3,949 4,294 3,949 4,294
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (144) (64) (144) (32)
Other comprehensive income before reclassifications 0 0 0 (32)
Amounts reclassified from accumulated other comprehensive income 0 0 0 0
Other comprehensive income (loss) 0 0 0 (32)
Ending balance (144) (64) (144) (64)
Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 3,716 3,112 4,326 3,100
Other comprehensive income before reclassifications 47 1,118 (545) 782
Amounts reclassified from accumulated other comprehensive income 42 0 24 348
Other comprehensive income (loss) 89 1,118 (521) 1,130
Ending balance $ 3,805 $ 4,230 $ 3,805 $ 4,230