Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net securities gains (losses)	$ 0	$ 258	$ 5	$ 106
Income tax expense	(3,702)	(4,145)	(9,533)	(7,384)
Net Income	15,613	16,614	36,537	29,491
Change in funded status of post retirement benefits	314	472	629	944
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net Income	(314)	(279)	(625)	(865)
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)	0	258	5	106
Income tax expense	0	(65)	(1)	(27)
Net Income	0	193	4	79
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	106	46	211	92
Net Income	(314)	(472)	(629)	(944)
Change in funded status of post retirement benefits	$ (420)	$ (518)	$ (840)	$ (1,036)