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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     $ 638  
Other comprehensive income (loss), net of tax $ 920 $ (916) 450 $ (955)
Ending balance 1,088   1,088  
Unrealized Gains and Losses On Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 113 19 583 164
Other comprehensive (loss) income before calculations 920 (984) 394 (1,215)
Amounts reclassified from accumulated other comprehensive income 0 74 56 160
Other comprehensive income (loss), net of tax 920 (910) 450 (1,055)
Ending balance 1,033 (891) 1,033 (891)
Postretirement Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 55 142 55 36
Other comprehensive (loss) income before calculations 0 (6) 0 100
Amounts reclassified from accumulated other comprehensive income 0 0 0 0
Other comprehensive income (loss), net of tax 0 (6) 0 100
Ending balance 55 136 55 136
Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 168 161 638 200
Other comprehensive (loss) income before calculations 920 (990) 394 (1,115)
Amounts reclassified from accumulated other comprehensive income 0 74 56 160
Other comprehensive income (loss), net of tax 920 (916) 450 (955)
Ending balance $ 1,088 $ (755) $ 1,088 $ (755)