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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Other comprehensive income (loss), net of tax $ 314 $ 920 $ 781 $ 450        
Total stockholders' equity 278,012 271,313 278,012 271,313 $ 266,177 $ 251,773 $ 261,816 $ 251,553
Unrealized Gains and Losses On Available-for-Sale Securities                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Other comprehensive (loss) income before calculations 319 920 740 394        
Amounts reclassified from accumulated other comprehensive income (2) 0 (6) 56        
Other comprehensive income (loss), net of tax 317 920 734 450        
Total stockholders' equity 1,034 1,033 1,034 1,033 717 300 113 583
Postretirement Benefit Plans                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Other comprehensive (loss) income before calculations (3) 0 47 0        
Amounts reclassified from accumulated other comprehensive income 0 0 0 0        
Other comprehensive income (loss), net of tax (3) 0 47 0        
Total stockholders' equity 102 55 102 55 105 55 55 55
Accumulated Other Comprehensive Income                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Other comprehensive (loss) income before calculations 316 920 787 394        
Amounts reclassified from accumulated other comprehensive income (2) 0 (6) 56        
Other comprehensive income (loss), net of tax 314 920 781 450        
Total stockholders' equity $ 1,136 $ 1,088 $ 1,136 $ 1,088 $ 822 $ 355 $ 168 $ 638