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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, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 200  
Other comprehensive income (loss) 360 $ (2,008)
Ending balance 560  
Unrealized Gains and Losses On Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 164 3,370
Other comprehensive income before calculations 186 (2,181)
Amounts reclassified from accumulated other comprehensive income 63 0
Other comprehensive income (loss) 249 (2,181)
Ending balance 413 1,189
Postretirement Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 36 (144)
Other comprehensive income before calculations 111 173
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income (loss) 111 173
Ending balance 147 29
Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 200 3,226
Other comprehensive income before calculations 297 (2,008)
Amounts reclassified from accumulated other comprehensive income 63 0
Other comprehensive income (loss) 360 (2,008)
Ending balance $ 560 $ 1,218