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Accumulated Other Comprehensive Loss - Reclassification of component (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Realized (gains) losses on sale of securities        
Net realized (gains) losses on investment securities     $ (84)  
Provision for income taxes     18  
Net of tax     (66)  
Amortization of estimated defined benefit pension plan loss        
Other expense $ 879 $ 611 2,949 $ 1,833
Provision for income taxes (185) (128) (619) (385)
Net of tax 694 483 2,330 1,448
Total reclassifications for the period $ 694 $ 483 $ 2,264 $ 1,448