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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, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 638  
Other comprehensive (loss) income (292) $ 360
Ending balance 346  
Unrealized Gains and Losses On Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 583 164
Other comprehensive income before calculations (333) 186
Amounts reclassified from accumulated other comprehensive income 41 63
Other comprehensive (loss) income (292) 249
Ending balance 291 413
Postretirement Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 55 36
Other comprehensive income before calculations 0 111
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive (loss) income 0 111
Ending balance 55 147
Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 638 200
Other comprehensive income before calculations (333) 297
Amounts reclassified from accumulated other comprehensive income 41 63
Other comprehensive (loss) income (292) 360
Ending balance $ 346 $ 560