Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of Net Periodic Pension Cost
Interest cost on projected benefit obligation	$ 2,950	$ 3,456	$ 3,987
Expected return on plan assets	(2,677)	(3,925)	(4,731)
Amortization of prior service credit - DNB merger	0	0	7
Recognized net actuarial loss	1,051	1,419	1,604
Settlement charge	1,629	833	0
Net Periodic Pension Expense	2,953	1,783	867
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss)
Net actuarial loss/(gain)	1,137	(1,282)	2,370
Recognized net actuarial loss	(1,051)	(1,419)	(1,604)
Settlement loss recognized	(1,629)	(833)	0
Recognized prior service credit	0	0	0
Total (Before Tax Effects)	(1,543)	(3,534)	766
Total Recognized in Net Benefit Cost and Other Comprehensive Income/(Loss) (Before Tax Effects)	$ 1,410	$ (1,751)	$ 1,633