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Earnings Per Common Share And Share Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Earnings Per Common Share And Share Awards [Line Items]              
Anti-dilutive shares excluded from computation of diluted earnings per share 24 26     24 13  
Number of SARs granted where exercise price was less than market price on date of grant         0 0  
SARs              
Earnings Per Common Share And Share Awards [Line Items]              
Share-based compensation arrangement by share-based payment award, grants in period, net of forfeitures   5 5 5 5   10
Share-based compensation arrangement by share-based payment award, grants in period, weighted average grant date fair value         $ 55.52 $ 62.60  
Share-based payment arrangement, expense         $ 337 $ 259  
Share-based payment arrangement, nonvested award, cost not yet recognized, amount $ 494       $ 494    
Maximum | SARs              
Earnings Per Common Share And Share Awards [Line Items]              
Share-based compensation arrangement by share-based payment award, shares purchased for award         250    
SARs expiration period         7 years    
SARs vesting period         5 years