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Accumulated Other Comprehensive Income (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net securities gains (losses) $ 258 $ 31 $ 106 $ 225
Income tax expense (4,145) (2,899) (7,384) (5,919)
Net Income 16,614 11,924 29,491 24,105
Change in funded status of post retirement benefits 472 384 944 788
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net Income (279) (361) (865) (619)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net securities gains (losses) 258 31 106 225
Income tax expense (65) (8) (27) (56)
Net Income 193 23 79 169
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Income tax expense 46 108 92 196
Net Income (472) (384) (944) (788)
Change in funded status of post retirement benefits $ (518) $ (492) $ (1,036) $ (984)